Re: raid 5 on linux --againnnn (sorryy it's big)

[<c4c3m@oke.net.id>]

I'm following your way to recover my lost partition.
when i try
mdadm.static -Af /dev/md6 /dev/sda11
mdadm.static -Af /dev/md6 /dev/sdb11
mdadm.static -Af /dev/md6 /dev/sdc11
then i reboot the machine

/var partition can be activated but when i look to /var partition
it was empty, there's no data at all. my data is lost ???
if it's true how to recover it ??

thanks a lot
Regards

Hendri



> On Friday July 25, c4c3m@oke.net.id wrote:
>> this is the messages from faulty machine:
>> #mdadm.static -Eb /dev/sdc*
>>
>> ARRAY /dev/md4 level=raid5 num-devices=3
>> UUID=12a3daa6:98bc6aca:98d38bed: 414bad01
>> devices=/dev/sdc9
>> ARRAY /dev/md3 level=raid5 num-devices=3
>> UUID=5c4fb8f2:7aad3154:83515188: 5945a00b
>> devices=/dev/sdc8
>> ARRAY /dev/md2 level=raid5 num-devices=3
>> UUID=31788297:ac6dab84:1dc952b3: fec35535
>> devices=/dev/sdc7
>> ARRAY /dev/md1 level=raid5 num-devices=3
>> UUID=ed01ad73:e4a5e4d0:90eb9b59: 15e5c3c0
>> devices=/dev/sdc6
>> ARRAY /dev/md8 level=raid5 num-devices=3
>> UUID=1708a6d1:96874201:39d9f451: bed35249
>> devices=/dev/sdc13
>> ARRAY /dev/md7 level=raid5 num-devices=3
>> UUID=f385575d:d3185f42:37e7d321: 4784a76c
>> devices=/dev/sdc12
>> ARRAY /dev/md6 level=raid5 num-devices=3
>> UUID=cdcae134:499035b2:e539a33a: 636fa315
>> devices=/dev/sdc11
>> ARRAY /dev/md5 level=raid5 num-devices=3
>> UUID=59f4a4fc:40471289:9d6e0430: 44f950a1
>> devices=/dev/sdc10
>> ARRAY /dev/md9 level=raid5 num-devices=3
>> UUID=3b2e48f6:efb0795d:6fa8e6c7: 18e6d984
>> devices=/dev/sdc1,/dev/sdc3,/dev/sdc4
>
> Thanks.
> After you sent me separately the whole set of information (/dev/sd*,
> not just /dev/sdc* ... why didn't you send it to the list too like I
> keep asking?).
>
> It appears that your machine crashed and when it came back up, sdb and
> sdc weren't accessable, so all the arrays got confused by the absense
> of sdb and sdc.
> You can fix it all up using the "-Af" or  "--assemble --force" options
> to mdadm.
> so
>
>   mdadm -Af /dev/md1 /dev/sd[abc]6
>   mdadm -Af /dev/md3 /dev/sd[abc]8
>   mdadm -Af /dev/md4 /dev/sd[abc]9
>   mdadm -Af /dev/md5 /dev/sd[abc]10
>   mdadm -Af /dev/md6 /dev/sd[abc]11
>
> should make it mostly happy again.
> This will make all of the raid5 array out of just two drives, the
> 'best' two in each case.
> Then you can add the third in. e.g.
>  mdadm /dev/md1 -a /dev/sdc6
>    Note: this assumes it was sdc6 that was left out. You should
>    check (mdadm -D /dev/md1 is a good way) and add in the missing
>    drive.
>
> NeilBrown
> -
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