Re: Help needed: array inactive after grow attempt

[Andread Mayrhoff <repro@spoilbase.eu>]

I might add

~/tmp # mdadm --stop /dev/md127
mdadm: stopped /dev/md127
~/tmp # mdadm --assemble --scan
mdadm: Failed to restore critical section for reshape, sorry.
        Possibly you needed to specify the --backup-file

Thanks for helping me out of this...

Am 2016-04-28 21:27, schrieb Andread Mayrhoff:
> Hello,
> 
> I believe I need some help from an mdadm expert.
> 
> I tried to add a disk to an existing RAID5-array (/dev/md127) that
> consisted of 5 disks: /dev/sd[bcdef]1
> The system is a 4.5.2-2-kernel, x86_64-architecture, mdadm 3.3.1.
> I attempted to add partition /dev/sdg1 to that array, in an attempt to
> create a 6-disk-RAID5-array.
> To achieve that goal, I typed "mdadm --add /dev/md127 /dev/sdg1".
> As I found that working, I attempted to grow the array by typing
> "mdadm --grow /dev/md127 --raid-devices=6".
> 
> I left my machine, and when I returned, I found it had been switched
> off by my... ahem, anyway, it had been switched off.
> 
> I powered it on again, "cat /proc/mdstat" returned
> 
>>> 
> Personalities : [raid6] [raid5] [raid4]
> md127 : inactive sdg1[9](S) sdf1[8](S) sdc1[5](S) sdb1[6](S)
> sde1[4](S) sdd1[7](S)
>       17578345656 blocks super 1.0
> 
> unused devices: <none>
> <<
> 
> mdadm --detail /dev/md127 returns
> 
>>> 
> /dev/md127:
>         Version : 1.0
>      Raid Level : raid0
>   Total Devices : 6
>     Persistence : Superblock is persistent
> 
>           State : inactive
> 
>   Delta Devices : 1, (-1->0)
>       New Level : raid5
>      New Layout : left-symmetric
>   New Chunksize : 128K
> 
>            Name : n54l:raid5.11111111.eu
>            UUID : b120f4d9:d1ba5648:e1359c5d:7a36372e
>          Events : 60868
> 
>     Number   Major   Minor   RaidDevice
> 
>        -       8       17        -        /dev/sdb1
>        -       8       33        -        /dev/sdc1
>        -       8       49        -        /dev/sdd1
>        -       8       65        -        /dev/sde1
>        -       8       81        -        /dev/sdf1
>        -       8       97        -        /dev/sdg1
> <<
> 
> Now, before I do anything extreme like unplugging that disk again or
> forcing a recreate, could an expert suggest the next logical step I
> should do. I know this sounds pretty defensive, but rather than
> playing "Raid-hero with an erased set of disks" I'd go along with
> "Raid-idiot that needed experts' advice which is why he still's got
> all his data".
> 
> Thanks for your advice!
> 
> 
> 
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