Re: RAID repartitioning
hi george
when things like mkraid /dev/mdxx and mdadd and raidstart fails...
mdctl works wonders ...
download...
http://www.cse.unsw.edu.au/~neilb/source/mdctl/mdctl-0.5.tgz
build it up manually ...
mdctl --assemble --force /dev/mdx /dev/sda1 /dev/sdb1 /dev/sdc1...
and be sure to have /dev/md10 and /dev/md11 defined in the new
/etc/raidtab
have fun raiding
alvin
http://www.1U-Raid5.net ... 1.6TeraBtye 1U Raid5 .. :-)
On Fri, 11 Jan 2002, George Karaolides wrote:
>
> Hi,
>
> I'm trying to repartition disks in a RAID array on potato, and have
> largely succeeded except for making a new RAID array to use the space I
> freed up on each disk.
>
> The machine runs kernel 2.2.19 with the "new" RAID patch compiled from
> the Debian packages of both kernel 2.2.19 and the raid patch.
>
> The disks are five identical scsi disks, /dev/sd[a-e].
>
> The last partition on each disk, /dev/sd[a-e]10, forms a RAID-5 array
> /dev/md10. The filesystem on this is mounted under /home.
>
> It was my intention to split /dev/md10 up into two smaller arrays because
> I was using a very small part of /dev/md10 for /home and was running out
> of space in /var.
>
> I backed up the /home filesystem data in /dev/md10, unmounted /home and
> then did raidstop /dev/md10. I re-partitioned the disks, reducing the
> size of /dev/sd[a-e]10 on each. I then did
>
> # mkraid /dev/md10
> # mke2fs -b 4096 -R stride=8 /dev/md10
> # mount -a
> # tar -x <restore data in /home from archive>
>
> This went just fine, I now have my home filesystem in a smaller array as I
> intended (I was using a very small part of it).
>
> While reducing the size of /dev/sd[a-e]10 on each disk, I also made a new
> partition /dev/sd[a-e]11 on each disk. The intention was to make these
> partitions into a new, additional RAID5 array /dev/md11.
>
> Trying to do this, I got the following error:
>
> # mkraid /dev/md11
> handling MD device /dev/md11
> analyzing super-block
> couldn't open device /dev/sda11 -- Device not configured
> mkraid: aborted, see the syslog and /proc/mdstat for potential clues.
>
> So I can't make my new partitions into a RAID-5 array.
>
> I haven't found any clues in either /proc/mdstat or the log files.
>
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