Re: 2 Disks Jumped Out While Reshaping RAID5

["Majed B." <majedb@gmail.com>]

I forgot to mention that I'm running mdadm 2.6.7.1 (latest in Ubuntu
Server repositories).

I tried forcing the assembly, but as mentioned, I just got an error:
root@Adam:/var/www# mdadm -Af /dev/md0
mdadm: superblock on /dev/sdh1 doesn't match others - assembly aborted

I know I could've pasted whatever I wrote here, but it seemed
redundant. I'll keep your hint in mind for the next time, if any
(hopefully not).

This may be of an interest to you:
root@Adam:/var/www# mdadm -E /dev/sd[a-h]1 | grep Reshap
sda1  Reshape pos'n : 3357066496 (3201.55 GiB 3437.64 GB)
sdb1  Reshape pos'n : 3357066496 (3201.55 GiB 3437.64 GB)
sdc1  Reshape pos'n : 3357066496 (3201.55 GiB 3437.64 GB)
sdd1  Reshape pos'n : 3357066496 (3201.55 GiB 3437.64 GB)
sde1  Reshape pos'n : 3357066496 (3201.55 GiB 3437.64 GB)
sdf1   Reshape pos'n : 3357066496 (3201.55 GiB 3437.64 GB)
sdg1  Reshape pos'n : 2554257664 (2435.93 GiB 2615.56 GB)
sdh1  Reshape pos'n : 3357066496 (3201.55 GiB 3437.64 GB)

Note that sdd1 was the spare.

The UUIDs are all the same and the superblock is all similar except
for the reshaping position of sdg1.

I didn't try to recreate the array as I've never faced this issue
before, so I don't know what kind of repercussions it may have.

What I do know, that at the worst case scenario, I can recreate the
array out of 7 disks (all but sdg1), but lose about 2.3TB worth of
data :(

On Sun, Sep 6, 2009 at 12:32 AM, NeilBrown<neilb@suse.de> wrote:
> On Sun, September 6, 2009 6:22 am, Majed B. wrote:
>> Hello all,
>>
>> I have posted my problem already here:
>> http://ubuntuforums.org/showthread.php?p=7900571#post7900571
>> It also has file attachments of the output of mdadm -E /dev/sd[a-h]1
>
> It seems that you need to log in to read the attachements... so I haven't.
>
>>
>> I appreciate any help on this.
>
> Hopefully you just need to add "--force" to the assemble command
> and it would all just work.  However I haven't tested that on an array
> that is in the process of a reshape so I cannot promise.
> I might try to reproduce your situation and with some scratch drives
> and check that mdadm -Af does the right thing, but it won't be a day
> or so, and as I cannot see the --examine output I might get the
> situation a bit wrong ... (hint hint: it is always best to post
> full information rather than pointers to it, unless said information is
> really really big).
>
> NeilBrown

-- 
       Majed B.
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