On Thursday 28 August 2008 10:32:32 thomas62186218@xxxxxxx wrote:
> Hi all,
>
> I am struggling with an issue on an Ubuntu 8.0.4 64-bit system. The
> system has 12 SATA drives. I create a RAID 5 array using mdadm as
> follows:
>
> mdadm -Cv /dev/md0 -n12 -l5 -c128 /dev/sd[b-m] -R -f
>
> The device creates successfully and starts and is visible as syncing in
> cat /proc/mdstat. But, according to mdadm -X /dev/md0, there is no md
> superblock on the device. Doing the same mdadm -X command for all
You need to run --detail for md devices
> components /dev/sdb through /dev/sdm shows superblocks. If I reboot the
--examine only works for the components
> system, /dev/md0 is completely gone, and a mdadm --assemble --scan
Did you add the corresponding entries to your mdadm.conf?
See this chapter in "man 8 mdadm"
<quote>
echo ’DEVICE /dev/hd[a-z] /dev/sd*[a-z]’ > mdadm.conf
mdadm --examine --scan --config=mdadm.conf >> mdadm.conf
This will find arrays which could be assembled from existing IDE and
SCSI whole drives (not partitions),
and store the information in the format of a config file. This file is
very likely to contain unwanted
detail, particularly the devices= entries. It should be reviewed and
edited before being used as an actual
config file.
</quote>
Cheers,
Bernd
--
Bernd Schubert
Q-Leap Networks GmbH
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