Re: mdadm 3.1.1: level change won't start

["Kristleifur Daðason" <kristleifur@gmail.com>]

On Mon, Dec 21, 2009 at 4:10 AM, Michael Evans <mjevans1983@gmail.com> wrote:
> On Sun, Dec 20, 2009 at 7:41 PM, Kristleifur Daðason
> <kristleifur@gmail.com> wrote:
>> Hi all,
>>
>> I wish to convert my 3-drive RAID-5 array to a 6-drive RAID-6. I'm on
>> Linux 2.6.32.2 and have mdadm version 3.1.1 with the 32-bit-array-size
>> patch from here: http://osdir.com/ml/linux-raid/2009-11/msg00534.html
>>
>> I have three live drives and three spares added to the array. When I
>> initialize the command, mdadm does the initial checks and aborts with
>> a "cannot set device shape" without doing anything to the array.
>>
>> Following are some md stats and growth command output:
>>
>> ___
>>
>> $ cat /proc/mdstat
>> Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
>> [raid4] [raid10]
>> md_d1 : active raid5 sdd1[6](S) sdc1[5](S) sdb1[4](S) sdf1[1] sde1[0] sdl1[3]
>>       2930078720 blocks super 1.1 level 5, 256k chunk, algorithm 2 [3/3] [UUU]
>>       bitmap: 1/350 pages [4KB], 2048KB chunk
>>
>> $ mdadm --detail --scan
>> ARRAY /dev/md/d1 metadata=1.01 spares=3 name=mamma:d1
>> UUID=da547022:042a6f68:d5fe251e:5e89f263
>>
>> $ mdadm --grow /dev/md_d1 --level=6 --raid-devices=6
>> --backup-file=/root/backup.md1_to_r6
>> mdadm: metadata format 1.10 unknown, ignored.
>> mdadm: metadata format 1.10 unknown, ignored.
>> mdadm level of /dev/md_d1 changed to raid6
>> mdadm: Need to backup 1024K of critical section..
>> mdadm: Cannot set device shape for /dev/md_d1
>> mdadm: aborting level change
>> ___
>>
>>
>> Three questions -
>>
>> 1. What does the stuff about "metadata format 1.10 unknown" mean?
>> Notice the "super 1.1" vs. "metadata 1.01" vs. "metadata format 1.10"
>> disrepancy between mdsat, --detail and --grow output.
>>
>> 2. Am I doing something wrong? :)
>>
>> 3. How can I get more info about what is causing the failure to
>> initialize the growth?
>>
>> Thanks!
>>
>> -- Kristleifur
>>
>>
>> (P.s., I'm cc-ing this directly to Neil Brown as the maintainer of
>> mdadm. I hope that isn't rude of me.)
>> --
>
>
> I thought there were three metadata variants for 1.x: 1.0 1.1 and 1.2
>  Maybe the extra 1 or 0 at the end refers to a reshape in progress?
>

Thanks for the reply. FWIW, I intended the array to have metadata
format 1.1 when I created it. I've noticed these "1.01" messages
before, so I believe it's not due to the reshape. However, I'm
thinking the funny metadata might be interfering with the reshape
somehow.

Hmm ...
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