[mythtv-users] OT: follies with RAID

[Martin Bene]

> Note that sdd is the raw drive, not a partition.
>
> selene:/data/home/yan#  /sbin/fdisk -l /dev/sdd
>
> Disk /dev/sdd: 400.0 GB, 400087375360 bytes
> 255 heads, 63 sectors/track, 48641 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Disk identifier: 0x00000000
>
> Disk /dev/sdd doesn't contain a valid partition table
>
> As opposed to
>
> selene:/data/home/yan#  /sbin/fdisk -l /dev/sdg
>
> Disk /dev/sdg: 400.0 GB, 400088457216 bytes
> 255 heads, 63 sectors/track, 48641 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Disk identifier: 0x000315f4
>
>    Device Boot      Start         End      Blocks   Id  System
> /dev/sdg1               1       48641   390708801   fd  Linux raid
> autodetect
>
>
> How do I go about fixing this?

Should be fairly easy: remove sdd from the raid array, partition it, add /dev/sdd1 to the array.

cat /proc/mdstat
==> Check that the array is fully operable, i.e that there are no failed drives/partitions (if output is the same as  in your mail, it's OK)

mdadm --fail /dev/md10 /dev/sdd
==> device /dev/sdd is marked as failed in the raid array

mdadm --remove /dev/md10 /dev/sdd
==> device /dev/sdd is completely removed from the array

sfdisk -d /dev/sdg | sfdisk /dev/sdd
==> repartition sdd just like sdg - if you don't have sfdisk on your system, just partition the drive manually using fdisk

mdadm --add /dev/md10 /dev/sdd1
==> Add partitioned device back into array. This will cause a resync of /dev/sdd1.

Bye, Martin
PS: Warning: the mdadm commands are from memory; should be OK but still..