Dead disk on raid6, bought a new one..... and now ?

hubertes · Mar 1st 2017

Hi,

Some 2TB disk went down, I bought a new one, pluged it in, rebooted,

on console I see that mdadm does not start in a degraded state.

Nothing to show in my omv raid tab

Here's my output (my old hard drive was sdg : new one is also sdg)

Thanks

Code

root@Zetta:~# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : inactive sdf[0] sdb[4] sde[3] sda[2] sdc[1]
      7814063800 blocks super 1.2




----------------


root@Zetta:~# blkid
/dev/sda: UUID="96b0e7b7-83aa-203f-1545-031b43caaa85" UUID_SUB="70983681-b5c2-9f70-1801-948b1b7c97d1" LABEL="zetta:0" TYPE="linux_raid_member"
/dev/sdb: UUID="96b0e7b7-83aa-203f-1545-031b43caaa85" UUID_SUB="66843575-1a9c-30a6-8172-29f3ded468dc" LABEL="zetta:0" TYPE="linux_raid_member"
/dev/sdd1: UUID="b364f189-c9af-4774-92ba-a49307966cf7" TYPE="ext4"
/dev/sdd5: UUID="c78b6a64-1caa-4290-bc1a-eebe67731ca5" TYPE="swap"
/dev/sde: UUID="96b0e7b7-83aa-203f-1545-031b43caaa85" UUID_SUB="ee7eab8f-dc90-e3be-146d-a4e09d104418" LABEL="zetta:0" TYPE="linux_raid_member"
/dev/sdf: UUID="96b0e7b7-83aa-203f-1545-031b43caaa85" UUID_SUB="b2460066-00b1-5070-cfe3-7ac67aae96c1" LABEL="zetta:0" TYPE="linux_raid_member"
/dev/sdc: UUID="96b0e7b7-83aa-203f-1545-031b43caaa85" UUID_SUB="2873612e-8481-0c22-4d4f-9183d2bf6a6d" LABEL="zetta:0" TYPE="linux_raid_member"

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hubertes · Mar 1st 2017

I tried adding the new drive, running mdadm, here is my log

Code

root@Zetta:~# mdadm -e /dev/sdg
mdadm: -e does not set the mode, and so cannot be the first option.
root@Zetta:~# mdadm --examine /dev/sdg
mdadm: No md superblock detected on /dev/sdg.
root@Zetta:~# mdadm --add /dev/md0 /dev/sdg
mdadm: add new device failed for /dev/sdg as 6: Invalid argument
root@Zetta:~# mdadm --run /dev/md0
mdadm: failed to run array /dev/md0: Input/output error
root@Zetta:~# dmesg | tail -n 30
[   18.728803] ADDRCONF(NETDEV_UP): eth0: link is not ready
[   21.012836] r8169 0000:02:00.0: eth0: link up
[   21.013367] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   25.559355] RPC: Registered named UNIX socket transport module.
[   25.559356] RPC: Registered udp transport module.
[   25.559357] RPC: Registered tcp transport module.
[   25.559358] RPC: Registered tcp NFSv4.1 backchannel transport module.
[   25.786931] FS-Cache: Loaded
[   25.855617] FS-Cache: Netfs 'nfs' registered for caching
[   25.870911] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
[   26.779190] Software Watchdog Timer: 0.07 initialized. soft_noboot=0 soft_margin=60 sec soft_panic=0 (nowayout= 0)
[   41.306712] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 2331.194279] md0: ADD_NEW_DISK not supported
[ 2390.892971] md/raid:md0: not clean -- starting background reconstruction
[ 2390.892993] md/raid:md0: device sdf operational as raid disk 0
[ 2390.892998] md/raid:md0: device sdb operational as raid disk 4
[ 2390.893002] md/raid:md0: device sde operational as raid disk 3
[ 2390.893007] md/raid:md0: device sda operational as raid disk 2
[ 2390.893011] md/raid:md0: device sdc operational as raid disk 1
[ 2390.893896] md/raid:md0: allocated 6384kB
[ 2390.893976] md/raid:md0: cannot start dirty degraded array.
[ 2390.894041] RAID conf printout:
[ 2390.894046]  --- level:6 rd:6 wd:5
[ 2390.894051]  disk 0, o:1, dev:sdf
[ 2390.894055]  disk 1, o:1, dev:sdc
[ 2390.894058]  disk 2, o:1, dev:sda
[ 2390.894061]  disk 3, o:1, dev:sde
[ 2390.894065]  disk 4, o:1, dev:sdb
[ 2390.894747] md/raid:md0: failed to run raid set.
[ 2390.894767] md: pers->run() failed ...
root@Zetta:~# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : inactive sdf[0] sdb[4] sde[3] sda[2] sdc[1]
      7814063800 blocks super 1.2


unused devices: <none>

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hubertes · Mar 2nd 2017

I ran stop mdadm, then add sdg, then reboot, mdadm repaired the arry.

Solved

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