On Thu, 2013-12-05 at 14:36 +0100, Bernd Schubert wrote:
> On 12/05/2013 01:30 AM, Wilson Jonathan wrote:
> > mdadm: /dev/sdf6 is identified as a member of /dev/md5, slot 2.
> > mdadm: /dev/sde6 is identified as a member of /dev/md5, slot 1.
> > mdadm: /dev/sdd6 is identified as a member of /dev/md5, slot 0.
> > mdadm: /dev/sdb6 is identified as a member of /dev/md5, slot 4.
> > mdadm: /dev/sda6 is identified as a member of /dev/md5, slot 3.
> > mdadm: ignoring /dev/sde6 as it reports /dev/sdf6 as failed
>
> [...]
>
> > So tried again, with a different (valid) chunk...
> >
> >
> > root@BorgCUBE:/mnt/datastore/wilsonjonathan# mdadm --create
> > --assume-clean --level=6 --raid-devices=6
> > --chunk=64 /dev/md5 /dev/sdd6 /dev/sde6
> > missing /dev/sdf6 /dev/sda6 /dev/sdb6
>
> Why are you using this order? Missing seems to be at the wrong place?
>
>
> Cheers,
> Bernd
Arr yes, I seem to have got the order wrong... before I continue and do
further damage; I put the original pulled drive (sdc) back in and re-ran
examine. Obviously I have corrupted the raid layout data on the other
disks (a,b,d,e,f) but here is the sdc examine output.
/dev/sdc6:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 9ff95b8b:ba34ad95:aa7cb806:169246f2
Name : PartedMagic:6
Creation Time : Fri Nov 25 16:30:19 2011
Raid Level : raid6
Raid Devices : 6
Avail Dev Size : 1833569679 (874.31 GiB 938.79 GB)
Array Size : 3667138560 (3497.26 GiB 3755.15 GB)
Used Dev Size : 1833569280 (874.31 GiB 938.79 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : active
Device UUID : 4ce632fb:d506da60:120cac8e:4433efc4
Internal Bitmap : 8 sectors from superblock
Update Time : Wed Dec 4 23:04:40 2013
Checksum : fe4e7b1f - correct
Events : 260243
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 5
Array State : AAAAAA ('A' == active, '.' == missing)
>
>
I mistook the order (a-b-c-d-) with the position number in the array.
If I'm reading this correctly, Active device 5 means it should be at
position 5, or the sixth disk in the array.
I also note it has a bitmap on it, something the other drives now lack
as it was not stated in the original forced create, so not sure how that
will affect things and the event count is lower, 260243, than the other
devices, 260321, before the array became corrupted (that said I know
exactly which files were being updated on the file system, so if I can
get it back I will just delete them and re-create).
Hopefully I have not totally killed the array by my mistakes.
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