Mdadm device missing. 20 GB) Array Size : 1953519344 (931.

Mdadm device missing After all, mdadm --create creates a new RAID from scratch with no data on it, so it does not matter which direction things are copied for the initial sync. mdadm: cannot open device /dev/sdg1: Device or resource busy mdadm: /dev/sdg1 has wrong uuid. mdadm: No md superblock detected on /dev/sda2. 9 (4-Feb-2014) The filesystem size (according to the superblock) is 59585077 blocks The physical size of the device is 59585056 blocks Either the superblock or the partition table is Mar 27, 2022 · # mdadm. Jan 10, 2019 · sudo mdadm --examine /dev/sda /dev/sda: Magic : a92b4efc Version : 1. I already tried booting into an old kernel (f37) still present on the system. 67 GiB 6000. 2 Feature Map : 0x1 Array UUID : 6d7fc4d9:6ca640d1:14235985:d87224f7 Name : lavie-server:0 (local to host lavie-server) Creation Time : Wed May 10 12:13:27 2017 Raid Level : raid5 Raid Devices : 4 Avail Dev Size : 7813775024 (3725. 51 GiB 1000. Dec 15, 2011 · [~] # mdadm --detail /dev/md0 /dev/md0: Version : 00. this device cannot be recovered because it is RAID0 with a missing device Jan 1, 2023 · I have a Ubuntu 22. /dev/md1: Version : 00. 98GiB raid0 2 devices, 0 spares. I could disable the daily warning by temporarily inserting exit 0 at the top of the script. mdadm: cannot open device /dev/sdg: Device or resource busy mdadm: /dev/sdg has Nov 25, 2024 · Step 4: Stop the RAID Device and Remove it From /etc/mdadm/mdadm. conf written out by anaconda MAILADDR root AUTO +imsm +1. Ive Started an Debian-Live to mount and save the data from my The drives show up in BIOS, and obviously I can fdisk them so they are working. 그리고, "mdadm --detail --scan" 값을 /etc/mdadm. 26 GiB 1489. 2 Creation Time : Fri May 31 17:44:49 2013 Raid Level : raid5 Array Size : 8789025216 (8381. Run the following commands on the removed device: mdadm --zero-superblock /dev/sdXn mdadm /dev/md0 --add /dev/sdXn The first command wipes away the old superblock from the removed disk (or disk partition) so that it can be added back to raid device for rebuilding. Apr 14, 2016 · /etc/mdadm/mdadm. 20 GB) Array Size : 1953519344 (931. 08 GiB 5994. 2 Creation Time : Tue Jul 24 13:22:48 2018 Raid Level : raid5 Array Size : 23441682432 (22355. The daily warning is generated by /etc/cron. But mdadm -Es showed up both arrays: Aug 26, 2022 · What am I missing to grow a RAID1 array with 2 disks into a RAID5 array with 3 disks? The array is inactive and missing a device after reboot! What I did: Changing the RAID level to 5: mdadm --grow /dev/md0 -l 5; Adding a spare HDD: mdadm /dev/md0 --add /dev/sdb; Growing the RAID to use the new disk: mdadm --grow /dev/md0 -n 3 Dec 23, 2021 · "If the device name given is missing then mdadm will try to find any device that looks like it should be part of the array but isn't and will try to re-add all such devices. 99 GB) Raid Devices : 4 Total Devices : 3 Persistence : Superblock is persistent Update Time : Tue Jul 12 11:31:52 2016 State Jun 11, 2015 · mdadm: looking for devices for /dev/md0 mdadm: /dev/sda is identified as a member of /dev/md0, slot 4. 54 GiB 122. ' == missing) mdadm --examine /dev/sde1 /dev/sde1: Magic : a92b4efc Version : 1. I hope you also realised that the old contents will be wiped in the process, so you might want to create a new array with one device missing (use mdadm --level=10 --raid-devices=8 --missing /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1). 65 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Wed Oct 16 16 Once\n" " : replacement completes, device will be marked faulty\n" " --with : Indicate which spare a previous '--replace' should\n" " : prefer to use\n" " --run -R : start a partially built array\n" " --stop -S : deactivate array, releasing all resources\n" " --readonly -o : mark array as readonly\n" " --readwrite -w : mark array as readwrite\n # mdadm --detail /dev/md2 /dev/md2: Version : 0. Finally, edit /etc/mdadm/mdadm. In my case, the mobo before and after were Intel RAID Matrix mobos, but I've never used Intel's RAID - always used mdadm and did RAID in the Apr 2, 2019 · I think I read documentation/internet left to right, but I cannot see anywhere information, how is mdadm invoked during system startup. 2 Feature Map : 0x2 Array UUID : e00a291e:016bbe47:09526c90:3be48df3 Name : ubuntu:0 Creation Time : Wed May 11 12:26:39 2011 Raid Level : raid1 Raid Devices : 2 Avail Dev Size : 1953519616 (931. 98 GB) Used Dev Size : 2925531648 (2790. You have to stop the RAID first, before removing a device. However, only dev/md0 was missing. 73 TiB 3. After rebooting, the server ended up in initramfs: mdadm: No devices listed in conf file were found. 2 Jun 6, 2013 · You might need to just do an --add and not a --re-add. mdadm: /dev/sdc is identified as a member of /dev/md0, slot 2. mdadm --create /dev/md6 --level=1 --raid-devices=2 missing /dev/sdk1 (doublecheck EVERYTHING before hitting return). in Debian 9 this file is placed there) menuentry of your old kernel (on which you successful run soft RAID). 00 UUID : ce3e369b:4ff9ddd2:3639798a:e3889841 Creation Time : Sat Dec 8 15:01:19 2012 Raid Level : raid5 Used Dev Size : 1463569600 (1395. 2 Creation Time : Sat Apr 13 18:47:42 2019 Raid Level : raid1 Array Size : 488244864 (465. Otherwise mdadm --create with two missing drives is also an option. 2 arrays and does the right thing without mdadm. 79 GiB 6000. conf file and removed the extra lines as I had when using BusyBox. d, I cannot see any systemd Oct 21, 2022 · /dev/md0: 199. Donc, si tu l'as créé auparavant avec un mknod, ça râle parce que le device existe déjà (d'où le "device already initialized"). The result is the same. $ mdadm --stop /dev/md1. 78 GB) Raid Devices : 5 Total Devices : 4 Preferred Minor : 0 Update Time The following article looks at the Recovery and Resync operations of the Linux Software RAID tools mdadm more closely. 89 GiB 2000. root@regDesktopHome:~# e2fsck /dev/md1 e2fsck 1. – In general, this option gives mdadm permission to get any missing information (like component devices, array devices, array identities, and alert destination) from the configuration file (see previous option); one exception is MISC mode when using --detail or --stop, in which case --scan says to get a list of array devices from /proc/mdstat. A separate array is created for the root and swap partitions. I had to remove the duplicated device using: $ sudo nano /etc/mdadm/mdadm. What puzzle piece am I missing? Mar 7, 2018 · mdadm --create /dev/md0 --level=0 --raid-devices=2 /dev/sdc /dev/sdd Then I used the resulting device in a ZFS pool: zpool attach tank sdb md0 That worked great. 37 GB) Used Dev Size : 2927205367 (2791. 32 MB) Raid Devices : 2 Total In general, this option gives mdadm permission to get any missing information (like component devices, array devices, array identities, and alert destination) from the configuration file (see previous option); one exception is MISC mode when using --detail or --stop, in which case --scan says to get a list of array devices from /proc/mdstat. You can use the mdadm commands verbose switch, -v, to get the list of devices from the --detail --scan switches output in a form that's pretty easy to parse into a comma separated form. # mdadm -Q /dev/md0. I mounted the device md0 and then came If the device name given is missing then mdadm will try to find any device that looks like it should be part of the array but isn't and will try to re-add all such devices. # # by default, scan all partitions (/proc/partitions) for MD superblocks. This can be used to find key information about a RAID device at a glance. And perhaps with the first drive missing, as that seems to have failed first Oct 31, 2023 · # sudo mdadm --detail /dev/md0 /dev/md0: Version : 1. 56 GB) Raid Devices : 3 Total Devices : 3 If the device name given is missing then mdadm will try to find any device that looks like it should be part of the array but isn't and will try to re-add all such devices. To my pleasant surprise, after the sync completed, mdadm made the "spare" into a regular part of the array. 42. # Note, if no DEVICE line is present, then "DEVICE partitions" is assumed. Feb 25, 2017 · Ive got an Problem with my JBOD, after my Synology DS died because of the failure of the Boot-HDD, ive wanted to recover my JBOD (3x3TB). I have a new QNAP TS-462 to try to replace it and I'd like to ensure my data is intact in the new system. Older mdadm version. What I found strange was the numbering of the devices which was 0 and 2. ZFS was happy, I was happy. 2 Creation Time : Tue Aug 7 18:51:30 2012 Raid Level : raid5 Array Size : 11702126592 (11160. cat /proc/mdstat and mdadm --detail --scan revealed both only one array (md1). If the device name given is missing then mdadm will try to find any device that looks like it should be part of the array but isn't and will try to re-add all such devices. 50 GiB 40002. 00 TB) Array Size : 26371206144 KiB I was a bit surprised that it was shown as active (even if earlier mdadm said that this device was removed from array) and the checksum was OK. 91 GiB 8001. This is an automatically generated mail message from mdadm running on <host> A SparesMissing event had been detected on md device /dev/md0. conf ('A' == active, '. May 30, 2023 · mdadm --create 명령어를 통하여 생성 할 수 있으며, 원하는 RAID 구성에 따라 원하는 level 과 raid-devices 구성을 입력해주면 되죠. P. However, there is no guarantee for this. and neither was successful in removing the failed device: # ~/mdadm/mdadm --version Sep 1, 2019 · /dev/md0: Version : 1. 43 GB) Raid Devices : 4 Total Devices : 3 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Thu Nov 2 14: I just set up a raid 5 array for my media server. 60 GiB 2997. 20 GB) Used Dev Size : 1953519344 (931. 91 GB) Used Dev Size : 2930133504 (2794. 96 GiB 2999. 62 GiB 11002. Oct 31, 2023 · # sudo mdadm --detail /dev/md0 /dev/md0: Version : 1. 1. /dev/sdb: Magic : a92b4efc Version : 1. 90 GiB 6001. x -all ARRAY /dev/md/boot level=raid1 num-devices=2 UUID=a2f6b6fe:31c80062:67e7a858:a21502a9 ARRAY /dev/md/boot_efi level=raid1 num-devices=2 UUID=ffbc39c9:ff982933:b77aece5:b44bec5f ARRAY /dev/md/root level=raid1 num-devices=2 UUID=b31f6af6:78305117:7ca807e7 May 31, 2021 · ('A' == active, '. After a reboot my /dev/md0 device was missing. The mdadm will load the configuration from your disks. 04 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time Dec 25, 2023 · I could do with some help troubleshooting an issue I encountered after I performed dnf system-upgrade, upgrading from 37 to 39 today. Oct 12, 2024 · 2. 4G 0 disk ├─sda1 8:1 0 256M 0 part /boot └─sda2 8:2 0 38. mdadm: cannot open device /dev/sdb5: Device or resource busy mdadm: /dev Dec 31, 2011 · /home/grus sudo mdadm --examine /dev/sd* /dev/sda: MBR Magic : aa55 Partition[0] : 16777216 sectors at 2048 (type 83) Partition[1] : 106312656 sectors at 16779264 (type 83) mdadm: No md superblock detected on /dev/sda1. 20 GB) Array Size : 10744359296 (10246. What I need to do is to be able to auto-assemble the md devices as outlined in mdadm. mdadm --stop /dev/md<number> mdadm --zero-superblock /dev/sd<x> (do this for all your raid disks) Run blkid and see if any of the raid devices show up. I configured it this way to be able to add another disk when I have a chance. 1G 0 lvm / └─centos_server01-var_log 253:1 0 (doublecheck EVERYTHING before hitting return). Don't specify /dev/sdf10 instead of the missing, this way no resyncing occurs at first. Now you need to run the following commands for each storage device that are part of the RAID device. 3 machine to boot from RAID1. May 30, 2020 · The mdmonitor. I have three disks in Apr 24, 2023 · # mdadm --examine /dev/sdl /dev/sdl: Magic : a92b4efc Version : 1. 51 GB) Array Size First make sure your raid device is stopped , then nuke the drives raid signature. You can also use mdadm to query individual component devices. mdadm: no RAID superblock on /dev/sdc mdadm: /dev/sdc has wrong uuid. Before adding those array, you need to stop them like this : mdadm --stop /dev/md11 mdadm --stop /dev/md12 mdadm --stop /dev/md15 mdadm --stop /dev/md0 Feb 16, 2024 · Welcome to the Tweaking4All community forums! When participating, please keep the Forum Rules in mind! Topics for particular software or systems: Start your topic link with the name of the application or system. 20 GB) Array Size : 2930279808 (2794. mdadm command to query an md device. 87 GiB 10000. It was different this time: now with journal and under WSL2 / Ubuntu. May 21, 2023 · Brief context. # cat /proc/mdstat Personalities : unused devices: # mdadm --examine --scan # mdadm Aug 31, 2010 · mdadm --verbose --assemble /dev/md0 mdadm: looking for devices for /dev/md0 mdadm: cannot open device /dev/md/1: Device or resource busy mdadm: /dev/md/1 has wrong uuid. conf file, but this is not the crucial point here, since mdadm should be able to reconstruct a RAID array, starting from superblock, that are missing on two of the three HD. conf mdadm -q --assemble --scan --run exit The system this comes up. I have a QNAP TS-451. S. Make sure that you run this command on the correct device!! Mar 26, 2021 · $ mdadm --assemble --scan --verbose mdadm: No super block found on /dev/nvme3n1 (Expected magic a92b4efc, got 00000000) mdadm: no RAID superblock on /dev/nvme3n1 mdadm: No super block found on /dev/nvme2n1 (Expected magic a92b4efc, got 00000000) mdadm: no RAID superblock on /dev/nvme2n1 mdadm: No super block found on /dev/nvme0n1 (Expected Jul 13, 2019 · Rescan for MD devices with mdadm. This is because it happens before your root file system is mounted (obviously: you have to have a working RAID device to access it), so this file is being read from the initramfs image containing the so-called pre-boot environment. The NAS has failed, but I'm pretty sure the drives are still fine. In general, this option gives mdadm permission to get any missing information (like component devices, array devices, array identities, and alert destination) from the configuration file (see previous option); one exception is MISC mode when using --detail or --stop, in which case --scan says to get a list of array devices from /proc/mdstat. Everything works, I hooked up everything for it to come up after a reboot, with UUIDs, tested it, not my first rodeo. 1. conf is not being read by the time the arrays are assembled. 54 GiB 122 I run a LVM setup on a raid1 created by mdadm. 60 GiB 9993. However, it doesn't quite apply. But why wouldn't Linux create devices for them? I saw this: Partition is missing in /dev. 22 GB) Raid Devices Aug 20, 2021 · Instead of failing a device prematurely you should grow the raid 1 by the number of added drives mdadm /dev/md0 --grow --raid-devices=4. e. # alternatively, specify devices to scan, using wildcards if desired. conf at boot time or that when assembling it honors the super-minor value for the 0. I couldn’t find a way to ignore particular mdadm devices. 56 GB) Used Dev Size : 1454645504 (1387. [b]mdadm --detail /dev/md0:[/b] /dev/md0: Version : 1. 0 GB, 64023257088 bytes 255 heads, 63 sectors/track, 7783 cylinders, total 125045424 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0009f38d Device Boot Start End Blocks Id System /dev/sdc1 Apr 11, 2020 · Try to run the device with “mdadm –run” Add the missing device to the RAID device with “mdadm –add” if the status of the RAID device goes to “active (auto-read-only)” or just “active”. 00 UUID : 7964c122:1ec1e9ff:efb010e8:fc8e0ce0 (local to host erwin-ubuntu) Creation Time : Sun Oct 10 11:54:54 2010 Raid Level : raid5 Used Dev Size : 976759936 (931. Faithfully yours, etc. 07 GB) Used Dev Size : 2929751932 (2794. 96 GB) Raid Devices : 2 Total Devices : 1 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Sun Sep 1 20:12:17 2019 State : clean, degraded Active Jan 28, 2021 · mdadmを使います。mdadmの詳しい使い方については、man mdadmとして確認しましょう。 上記で確認したデバイスのパーティション3つ（ここでは/dev/sdm1 /dev/sdn1 /dev/sdl1とする）を1つのRAIDアレイにします。 Nov 1, 2014 · mdadm --create /dev/md0 --level=1 --raid-devices=2 missing /dev/sdb1 mdadm: cannot open /dev/sdb1: Device or resource busy sudo umount /dev/sdb1 umount: /dev/sdb1: not mounted lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 38. I cannot see anything in /etc/rcX. Mar 15, 2019 · The above is assuming that /dev/sdh10 is "active device 2" and /dev/sdi10 is "active device 3", and that the old device 1 has failed. 43 GB) Raid Devices : 4 Total Devices : 3 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Thu Nov 2 14: Mar 29, 2023 · $ sudo mdadm --assemble --scan --verbose mdadm: Devices UUID-c5d7f13c:4d9bc7ac:bff90942:065235e7 and UUID-c5d7f13c:4d9bc7ac:bff90942:065235e7 have the same name: /dev/md0 mdadm: Duplicate MD device names in conf file were found. 52 GiB 1998. IMPORTANT: you need to run this for each member of the RAID device. You can then check that the filesystem is intact (modulo the unclean shutdown); if so, you can proceed by adding /dev/sdd1 to the array: Mar 26, 2022 · In this situation, you can only try your luck with mdadm --assemble --force (to ignore the "non-fresh" Events counter), using only the 5 best drives, ignoring the very outdated and missing drives. mdadm: ignoring /dev/sdb as it reports /dev/sda as Apr 16, 2021 · Some weeks ago I set up a software RAID 1 with mdadm, consisting of two 2TB WD Red HDDs, as a backup medium (Debian Stable). 2 Creation Time : Wed Oct 16 16:51:48 2019 Raid Level : raid1 Array Size : 3906886464 (3725. 2 Feature Map : 0x1 Array UUID : f0f7a964:3a8f5f80:a539aff3:cab7a6a5 Name : fileserver:6 (local to host fileserver) Creation Time : Mon Mar 16 15:07:55 2015 Raid Level : raid6 Raid Devices : 6 Avail Dev Size : 7813774957 (3725. sudo mdadm --verbose --create /dev/md0 --level=0 --raid-devices=3 /dev/sdc /dev/sdf /dev/sde mdadm: chunk size defaults to 512K mdadm: /dev/sdc appears to contain an ext2fs file system size=500107608K mtime=Wed Sep 28 20:32:12 2022 mdadm: /dev/sdc appears to be part of a raid array: level=raid0 devices=3 ctime=Thu Sep 22 04:40:03 2022 mdadm Jan 25, 2018 · However also the other one is in a bad shape. May 28, 2023 · It is possible to create a degraded mirror, with one half missing by replacing a drive name with "missing": mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sdb1 missing The other half mirror is added to the set thus: mdadm --manage /dev/md1 --add /dev/sda1 Jul 13, 2016 · [root@pithos dev]# mdadm -D /dev/md1 /dev/md1: Version : 1. conf and replaced the old UUID line with the one output from above command and my problem went away. 65 GB) Array Size : 11720661504 Feb 26, 2016 · I have a Debian Jessie (3. 1 Creation Time : Sat Jul 7 18:23:24 2012 Raid Level : raid1 Array Size : 2929751932 (2794. Oct 19, 2022 · /dev/sda: Magic : a92b4efc Version : 1. 96 GB) Used Dev Size : 1951945600 (1861. Then run mdadm --examine /dev/sda and check what Array UID it belongs to. conf Mar 25, 2015 · /dev/md0: Version : 1. I mounted the device md0 and then came Jun 7, 2018 · head -23 mdadm. So /dev/sdc1 /dev/sdd1 (the order does not matter) are the two real 1TB disks that are assembled into the one logical raid disk at /dev/md0. conf > c. Where is the Missing Disk Space on Linux Software Raid. Here comes one of the important procedures to take in removing a mdadm RAID device. mdadm: /dev/sdb is identified as a member of /dev/md0, slot 1. Mar 26, 2012 · After restarting my server today, I attempted to restart my 4 disk mdadm RAID 5 array as follows. if you read the man page about --re-add it talks about re-adding the device if the event count is close to the rest of the devices. OR # mdadm --query /dev/md0. 28 MiB 2145. Dec 28, 2014 · The missing causes the device to be created in degraded mode, hence no resyncing of the disks will occur. 2 Feature Map : 0x0 Array UUID : 6db9959d:3cdd4bc3:32a241ad:a9f37a0c Name : merlin:0 (local to host merlin) Creation Time : Sun Oct 28 12:12:59 2012 Raid Level : raid5 Raid Devices : 3 Avail Dev Size : 3905299943 (1862. You might have to mdadm --create with overlays for this one (with correct data offset, chunk size, and drive order). 78 GB) Used Dev Size : 9766304768 (9313. daily/mdadm. mdadm: metadata format 00. 9 array and the name (apparently <hostname>:<super-minor>) for the 1. I ended up with recreating the whole raid setup. conf, and remove the entry for the RAID array. Once\n" " : replacement completes, device will be marked faulty\n" " --with : Indicate which spare a previous '--replace' should\n" " : prefer to use\n" " --run -R : start a partially built array\n" " --stop -S : deactivate array, releasing all resources\n" " --readonly -o : mark array as readonly\n" " --readwrite -w : mark array as readwrite\n /dev# mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda1 missing -f mdadm: device /dev/sda1 not suitable for any style of array It seems like Debian thinks the drive is already in an array but it's not. Disk /dev/sdc: 64. 40GiB raid1 2 devices, 0 spares. 63 GiB 499. Getting Information about Component Devices. Jan 4, 2016 · root@server:~# mdadm --examine /dev/sd[abcdef]1 /dev/sda1: Magic : a92b4efc Version : 1. conf file a bit. mdadm: cannot open device /dev/sdd: Device or resource busy mdadm: /dev/sdd has wrong uuid. alternatively, specify devices to scan, using # wildcards if desired. If the device name given is faulty then mdadm will find all devices in the array that are marked faulty , remove them and attempt to immediately re-add them. Use mdadm --detail for more detail. degraded mdadm RAID5 Dec 9, 2021 · Usage: mdadm --create device --chunk=X --level=Y --raid-devices=Z devices This usage will initialise a new md array, associate some devices with it, and activate the array. root@teamelchan:~# mdadm --create --verbose /dev/md0 --level=0 --raid-devices=4 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 mdadm: chunk size defaults to 512K mdadm: /dev/sda1 appears to contain an ext2fs file system size=471724032K mtime=Sun Nov Nov 20, 2016 · This is a safe operation: if there aren't enough pieces of the array available to have a complete set of data (eg. Additional steps that didn’t seem to work: I copied away the /etc/mdadm/mdadm. 65 GB) Array Size Aug 9, 2011 · Iâ m trying to convert a running SuSE 11. c mv c. This can be # mdadm --create -o --assume-clean --level=5 --layout=ls --chunk=512 --raid-devices=3 /dev/md0 missing /dev/sdd1 /dev/sde1 mdadm: /dev/sdd1 appears to contain an ext2fs file system size=1465135936K mtime=Sun Oct 23 13:06:11 2011 mdadm: /dev/sdd1 appears to be part of a raid array: level=raid5 devices=3 ctime=Sun Oct 30 00:10:47 2011 mdadm: /dev Version : 1. 90 Creation Time : Thu May 20 12:32:25 2010 Raid Level : raid1 Array Size : 1454645504 (1387. 04 GiB 495. 47 GB) Used Dev Size : 729952192 (696. 46 GB) Used Dev Size : 2930135488 (2794. " If you move up to the version 1 superblock then the metadata can move to the beginning or near the beginning of the device. 73 GiB 24004. 14 GiB 747. 04 GB) Used Dev Size : 483433472 (461. On each of the harddrives is another partition, which together belong to dev/md1. The system no longer boots due to missing MD RAID devices. 61 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Update Time : Sat Mar 25, 2014 · # mdadm --create root --level=1 --raid-devices=2 missing /dev/sdb1 # mdadm --create swap --level=1 --raid-devices=2 missing /dev/sdb2 These commands instructs mdadm to create a RAID1 array with two drives where one of the drives is missing. They must not be active. 51 Result of sudo fdisk -l as you can see sda and sdb are missing. Perhaps devtmpfs was mounted on /dev after the root@s01 [~]# mdadm --detail /dev/md1 /dev/md1: Version : 1. mdadm --stop /dev/mdX. 40 GiB 3000. 70 GB) Raid Devices : 6 Total Devices : 6 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Wed Apr 14 14:20:42 2021 State : clean, degraded In the meantime, I've figured out that my superblocks seem to be damaged (PS I have confirmed with tune2fs and fdisk that I'm dealing with an ext3 partition):. 2 Creation Time : Sun Dec 11 21:09:08 2016 Raid Level : raid5 Array Size : 8781616128 (8374. The --with option is optional, if not specified, any available spare will be used. mdadm --zero-superblock /dev/sdXY. 99 GiB 8. 87 GiB 8999. Dec 23, 2021 · "If the device name given is missing then mdadm will try to find any device that looks like it should be part of the array but isn't and will try to re-add all such devices. Now I've bought the second disk and tried running this command: mdadm --add /dev/md0 /dev/sdb1 But I'm getting this error: mdadm: /dev/sdb1 not large enough to join array Oct 11, 2020 · For mdadm --create and RAID 1, it's usually the first device copied to the second one. 74 GB) Raid Devices : 5 Total Devices : 5 Persistence : Superblock is persistent Update Time : Fri Jan 17 20:48:12 2014 State : clean, degraded Active Devices : 4 * Instaldo mdadm package (Yes) When you enter the fdisk -l command I have: Device Boot Start End Blocks Id System / Dev / sda1 * 2048 37,750,783 18,874,368 83 Linux / Dev / sda2 37,752,830 41,940,991 2,094,081 5 Extended / Dev / sda3 75694080 79790079 2048000 83 Linux / Dev / sda4 79790080 83886079 2048000 83 Linux / Dev / sda5 37,752,832 Aug 7, 2019 · $> sudo mdadm -E /dev/sdc /dev/sdc: Magic : Intel Raid ISM Cfg Sig. See the description of this option when used in Assemble mode for an explanation of its use. c mdadm. Grub can't be installed into MBR on drives >2TB, thus I have GPT with 1MB bios partition: Device St The reason is two-fold: Your (new)mdadm. 2 Creation Time : Wed Aug 12 20:25:02 2020 Raid Level : raid6 Array Size : 39065219072 (37255. 39 GiB 3000. 2 Feature Map : 0x9 Array UUID : 530afddc:f4e62791:eba1539c:15672d1d Name : ubuntu:0 Creation Time : Sat Aug 17 11:37:44 2019 Raid Level : raid5 Raid Devices : 3 Avail Dev Size : 11720778895 (5588. 47 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 2 Persistence : Superblock is persistent Update Time : Tue Nov 12 17:48:53 2013 State You can run mdadm --detail /dev/md0 to get the UUID of the RAID array, in your case it's "7dfb32ef:8454e49b:ec03ac98:cdb2e691". 90 unknown, ignored. 90. mdadm: looking for devices for /dev/md0 mdadm: no RAID superblock on /dev/sde mdadm: /dev/sde has wrong uuid. 07 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Thu Jul 7 Jan 5, 2024 · As you can see above, you have 4 md devices. Oct 30, 2021 · Let's say that I have the following ARRAY: mdadm -Q --detail /dev/md0 /dev/md0: Version : 1. I assume /dev/sdl is defect. 04 GB) Array Jun 30, 2012 · Not sure if this was the cleanest way to resolve the issue, but the following appears to have got it going again: root@uberserver:~# mdadm --stop /dev/md_d1 mdadm: stopped /dev/md_d1 root@uberserver:~# mdadm --add /dev/md1 /dev/sdd1 mdadm: re-added /dev/sdd1 root@uberserver:~# cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md1 : active Mar 7, 2018 · # # Please refer to mdadm. I was a bit surprised that it was shown as active (even if earlier mdadm said, that this device was removed from array) and its checksum was OK. mdadm: /dev/sdd is identified as a member of /dev/md0, slot 3. $ mdadm --assemble /dev/md0 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 mdadm: no recogniseable superblock on /dev/sdb1 mdadm: /dev/sdb1 has no superblock - assembly aborted Obviously, this is bad, it appears somehow when I restarted it managed to nuke the md superblock on /dev/sdb1. 00 Orig Family : c1155891 Family : c1155891 Generation : 000000d2 Attributes : All supported UUID : fe0bb25b:d021df67:4d7fe09f:a30a6e08 Checksum : 03482b05 correct MPB Sectors : 1 Disks : 2 RAID Devices : 1 Disk01 Serial : WD-WXV1E747PDZD State : active Id Sep 15, 2017 · man mdadm has a section for "DEVICE NAMES" at the end, a few options – Xen2050. service runs permanently and immediately notifies about changes of mdadm devices. three drives missing from a RAID6, or a matched pair missing from a RAID10), mdadm will do nothing. erwin@erwin-ubuntu:~$ sudo mdadm --examine /dev/sd*1 /dev/sda1: Magic : a92b4efc Version : 0. you can use --examine to find this out. The /proc/mdstat file currently contains the following: Personalities : [raid1] md0 : active raid1 sda1[0] sdb1[1] 731592000 blocks [2/2] [UU] unused devices: <none> If the device name given is missing then mdadm will try to find any device that looks like it should be part of the array but isn't and will try to re-add all such devices. 7-ckt20-1+deb8u3) system with RAID1 on 2x 3TB hard drives. 2 Creation Time : Thu Sep 26 14:46:34 2019 Raid Level : raid1 Array Size : 483433472 (461. conf(5) for information about this file. /dev/md2: Version : 1. On reading this thread I found that the md2 RAID device had a new UUID and the machine was trying to use the old one. The VG on top of md2 has 4 LVs, var, home, usr, tmp. Try running fsck on the resulting md device. Ok dmesg does indicate problem with harddisk. This marks the bad disk's partition as failed, then removes it from the RAID. 96 GB) Used Dev Size : 488244864 (465. This is a RAID-1 array from two partitions of two harddrives. Aug 11, 2022 · root@GalensSynology:~# mdadm --query --detail /dev/md2 /dev/md2: Version : 1. 53 GiB 3000. 1G 0 part ├─centos_server01-root 253:0 0 37. md2 is based on sda6 (major:minor 8:6) and sdb6 (8:22). Sample Output: root@ubuntu-PC:~# mdadm --query /dev/md0 /dev/md0: 19. Apr 28, 2022 · # cat /etc/mdadm. Rebooted; Server again boots to Busybox with the same messages. -r, --remove remove listed devices. 28 GB) Used Dev Size : 7813894144 (7451. If they do. ' == missing, 'R' == replacing) root@htpc:~# mdadm -E /dev/sdc1 /dev/sdc1: Magic : a92b4efc Version : 1. 3. This method is rather unspecific though. But the md device for / on the running system does not exist in /dev! Among other things, this has prevented me from adding the original root partition to the array. 2 Creation Time : Sun Apr 27 04:00:32 2014 Raid Level : raid1 Array Size : 2930135488 (2794. 90 Creation Time : Wed Oct 26 12:27:49 2011 Raid Level : raid1 Array Size : 729952192 (696. Jul 19, 2020 · $ sudo mdadm --examine /dev/sdb1 [sudo] password for pi: /dev/sdb1: Magic : a92b4efc Version : 1. run: dd if=/dev/zero of=/dev/sd<x> bs=512 count=1 This will hopefully nuke the partition tables. # mdadm --examine /dev/sda3 /dev/sda3: Magic : a92b4efc Version : 00. If the device name given is faulty then mdadm will find all devices in the array that are marked faulty, remove them and attempt to immediately re-add them. cfg' (i. Sep 27, 2008 · This starts the syncing process, which took a while on the large partitions, much less time on the smaller ones. Version : 1. 46 GB) Raid Devices : 4 Total Devices : 4 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Mon Jul 22 23:26:15 2019 State : clean, degraded Active Devices : 3 Working "mdadm --remove missing" which is the other option in these circumstances. 26 GB) Array Size : 5860147200 (5588. 2 Feature Map : 0x1 Array UUID : 9fd0e97e:8379c390:5b0dac21:462d643c Name : ncloud:vo1 (local to host ncloud) Creation Time : Tue Jan 25 11:23:04 2022 Raid Level : raid5 Raid Devices : 4 Avail Dev Size : 3906764976 (1862. 00 GiB 2995. Nov 18, 2018 · Load system with old kernel. 46 GB) Raid Devices : 4 Total Devices : 4 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Tue Mar 24 23:56:21 2015 State : clean, degraded Jul 12, 2017 · I have been using my HDD as part of software RAID 1 array with the second device missing. conf 에 현재 설정을 저장해주는 이유는 서버를 재부팅 하였을대에 raid devices의 이름이 랜덤하게 Aug 10, 2024 · I was able to determine that there is a valid LUKS header at the beginning of the drive with device number 2 (Device Role: Active device 2, currently /dev/sdb). md2 is partition 9:2. This ensures that we always have redundancy. 19 GiB 1999. Apr 27, 2014 · Code: Select all [b]mdadm --query /dev/md0:[/b] /dev/md0: 2794. mdadm: error Oct 16, 2019 · PROMPT> mdadm --detail /dev/md[01] /dev/md0: Version : 1. 58 GB) Used Dev Size : 8382464 (7. Here is the list according to the above schema : /dev/md11 /dev/md12 /dev/md15 /dev/md0; The /dev/sdc4 is only an ext3 files system partition. 77 GiB 1498. 70 GB) Array Size : 5854278400 (5583. 2 Feature Map : 0x1 Array UUID : 829c0c49:033a810b:7f5bb415:913c91ed Name : DataBackup:back (local to host DataBackup) Creation Time : Mon Feb 15 13:43:15 2021 Raid Level : raid5 Raid Devices : 10 Avail Dev Size : 5860268976 sectors (2. 79 GB) Used Dev Size May 28, 2024 · root@PennyNAS:~# mdadm --assemble --scan --verbose mdadm: looking for devices for further assembly mdadm: no recogniseable superblock on /dev/md/1 mdadm: no recogniseable superblock on /dev/md/0 mdadm: /dev/sdd2 is busy - skipping mdadm: /dev/sdd1 is busy - skipping mdadm: No super block found on /dev/sdd (Expected magic a92b4efc, got 00000000 If the device name given is missing then mdadm will try to find any device that looks like it should be part of the array but isn't and will try to re-add all such devices. Then format the filesystem on the new array volume and copy all data from /dev/sda1 # mdadm /dev/md0 --add /dev/sdc1 # mdadm /dev/md0 --replace /dev/sdd1 --with /dev/sdc1 sdd1 is the device you want to replace, sdc1 is the preferred device to do so and must be declared as a spare on your array. 2 Creation Time : Fri Oct 29 17:35:52 2021 Raid Level : raid1 Array Size : 8382464 (7. May 29, 2021 · It looks odd. If it's the same and sda is missing in the mdadm --detail /dev/md0 output, then it's most likely that disk which was removed. Have fdisk create a partition table and an md partition (mdadm manpage says use 0xDA, but every walkthrough and my own experience says 0xFD for raid autodetect), then. 02 GiB 11982. 04 LTS Jammy Jellyfish system with RAID0 and LVM on 2x 2TB hard. 03 GiB 3000. Wait for the RAID device to recover. Seems to work â I copied / and /boot to (degraded) md arrays, and have successfully booted from the new disk. 99 GB) Array Size : 120109056 (114. The -Q or --query flags of mdadm command examine a device to check if it is an md device or a component of an md array. 96 GB) Used Dev Size : 2929675072 (2793. 03 Creation Time : Fri May 22 21:05:28 2009 Raid Level : raid5 Array Size : 9759728000 (9307. 90 GiB 4000. mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1 Now the numbers are 0 and 1 again. I recreated RAID with: mdadm --assemble /dev/md0 --scan The command mdadm --detail /dev/md0 showed that all drives were running and system was in "clean" state. I assume that tells me the issue is not with f39, but with the MD RAID itself. 58 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Update Time : Sat Oct 30 07:29:40 2021 State : clean Active Devices : 2 Working $ sudo mdadm --examine /dev/sd[ijmop]1 /dev/sdi1: Magic : a92b4efc Version : 1. This header is recognized when the drive is accessed directly without mdadm . (according to mdadm --detail /dev/md0) After that I modified my /etc/mdadm/mdadm. conf. 46 GB) Raid Devices : 2 Total Devices : 2 Persistence Dec 9, 2014 · Method #1 - using mdadm's details. 80 GiB 8992. the syntax is mdadm --assemble device options devices where device is the logical (software) raid device and devices are the physical disk devices. 65 GB) Used Dev Size : 3906886464 (3725. 43 GB) Array Size : 54697259008 (52163. 2 Creation Time : Wed Aug 22 02:58:04 2012 Raid Level : raid5 Array Size : 5860267008 (5588. $ mdadm --detail /dev/md1 mdadm: metadata format 00. Note: You still need a 3. . Then, find in '/boot/grub/grub. conf # mdadm. 16. After crating a RAID array, you should always generate mdadm. root@tinas:~# cat /etc/mdadm/mdadm. Now after rebooting the system the md0 device was gone and I don't know how to bring it back. 37 GiB 56009. RAID volumes disappeared after the system reboot. mdadm --examine --scan I edited /etc/mdadm/mdadm. 88GiB raid10 4 devices, 0 spares. md-raid devices are not persistent across system reboots. 99 Mar 29, 2023 · $ sudo mdadm --assemble --scan --verbose mdadm: Devices UUID-c5d7f13c:4d9bc7ac:bff90942:065235e7 and UUID-c5d7f13c:4d9bc7ac:bff90942:065235e7 have the same name: /dev/md0 mdadm: Duplicate MD device names in conf file were found. Is there a workaround or I am missing something? root@DESKTOP:~# mdadm -v --grow --raid-devices=7 /dev/md0 mdadm: Cannot set device shape for /dev/md0: Invalid argument Array details: Ta commande mdadm doit normalement créer le device md0. I set got 2 new disks, and set up an array with one missing drive, to copy the data from the old single drive to the new array, and later I will ad Apr 7, 2021 · # mdadm -vv --assemble /dev/md0 mdadm: looking for devices for /dev/md0 mdadm: no RAID superblock on /dev/md/3 mdadm: no RAID superblock on /dev/md/2 mdadm: no RAID superblock on /dev/md/1 mdadm: no RAID superblock on /dev/sde2 mdadm: no RAID superblock on /dev/sde1 mdadm: no RAID superblock on /dev/sde mdadm: no RAID superblock on /dev/sr1 Apr 7, 2021 · # mdadm -vv --assemble /dev/md0 mdadm: looking for devices for /dev/md0 mdadm: no RAID superblock on /dev/md/3 mdadm: no RAID superblock on /dev/md/2 mdadm: no RAID superblock on /dev/md/1 mdadm: no RAID superblock on /dev/sde2 mdadm: no RAID superblock on /dev/sde1 mdadm: no RAID superblock on /dev/sde mdadm: no RAID superblock on /dev/sr1 May 5, 2006 · [root@boll etc]# mdadm --assemble --scan -v mdadm: looking for devices for /dev/md/0 mdadm: no RAID superblock on /dev/sdl mdadm: no RAID superblock on /dev/sdk mdadm: no RAID superblock on /dev/sdj mdadm: no RAID superblock on /dev/sdi mdadm: no RAID superblock on /dev/sdh mdadm: no RAID superblock on /dev/sdg mdadm: cannot open device /dev/sdf4: Device or resource busy mdadm: cannot open Dec 22, 2012 · Output of your first command does inidicate something is up with /dev/sdl. 00 UUID : 2f331560:fc85feff:5457a8c1:6e047c67 (local to host mserver) Creation Time : Sun Feb 1 20:53:39 2009 Raid Level : raid5 Used Dev Size : 976759936 (931. Jul 24, 2019 · $ sudo mdadm --detail /dev/md127 Version : 1. Notice that mdadm will refuse to do so without the --run flag: deltik@workstation [/media/datadrive]# sudo mdadm /dev/sdb1: Magic : a92b4efc Version : 0. Aug 17, 2018 · ~$ sudo mdadm --assemble --scan --verbose mdadm: looking for devices for /dev/md/0 mdadm: No super block found on /dev/md/0 (Expected magic a92b4efc, got 000000ef) mdadm: no RAID superblock on /dev/md/0 mdadm: No super block found on /dev/md/1 (Expected magic a92b4efc, got 0000040d) mdadm: no RAID superblock on /dev/md/1 mdadm: /dev/sdd2 has Dec 17, 2017 · Now create the RAID of your choice with mdadm using the partition device files, not the disk devices. 2 Feature Map : 0x1 Array UUID : c3178bbd:a7547105:dca0fc2a:4c137310 Name : raspi:0 Creation Time : Sun Feb 16 09:29:07 2020 Raid Level : raid1 Raid Devices : 2 Avail Dev Size : 240218112 (114. 79 GB) Raid Devices : 6 Total Devices : 5 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Wed Dec 14 19:09: The available size of each device is the amount of space before the super block, so between 64K and 128K is lost when a device in incorporated into an MD array. Stop the RAID device with the command. " Note that "missing" is highlighted in the man page, meaning the word "missing" must be used instead of a device. conf # # Please refer to mdadm. Here are the steps and the RAID status and its changes: STEP 1) Check if the kernel modules are loaded. As suggested using 'md2' output from . # # by default (built-in), scan all partitions (/proc/partitions) and all # containers for MD superblocks. This will stop the RAID array from working. When the rebuild is complete, run mdadm -f <md device> -f <bad disk's partition> followed by `mdadm -f -f for each RAID1 that uses the bad disk. 2 Feature Map : 0x1 Array UUID : 7399b735:98d9a6fb:2e0f3ee8:7fb9397e Name : Freedom-2:127 Creation Time : Mon Apr 2 18:09:19 2018 Raid Level : raid5 Raid Devices : 8 Avail Dev Size : 15627795456 (7451. Aug 25, 2015 · Assemble the array from one missing device in RAID 5. 2 Feature Map : 0x0 Array UUID : 0f8c1f2c:69356c09:b74f75f6:0d321be4 Name : mastermind UPDATE: added output of mdadm # mdadm --examine /dev/sdb1 /dev/sdb1: Magic : a92b4efc Version : 1. gst ahj atufchp ccfg kaaadd qcusld mtffg xqtv zzwkbou vvlt