Re: Software RAID on SPARC64
Not sure this is actually it (I'm just guessing here), but are you
starting the raid partition on cylinder 0? Or cyl 1? I *think* (though
I'm not sure) that starting on cylinder 0 actually puts the disklabel into
the beginning of the partition itself. This isn't a problem for UFS, as
UFS leaves 8k unused at the beginning of the FS, but it might be a problem
for md.
Again, that's just a shot in the dark, take it for what it's worth.
-- Sam
On Mon, 18 Jul 2005, David Johnson wrote:
> Hi all,
>
> I've been having problems with software RAID (using mdadm) on Sarge on an
> Ultra Enterprise 450. There seems to be a bug somewhere causing corruption of
> Sun disk labels.
>
> I start with 8 SCSI disks with valid Sun disk labels and one partition filling
> each disk. The partition types are set to "Linux RAID autodetect".
>
> I can create a RAID 5 array without problems. This is the command I'm using:
> mdadm -C -l5 -n7
> -x1 /dev/md0 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1 /dev/sdi1 /dev/sdj1 /dev/sdk1
>
> If I now reboot, everything is OK and the array is detected and configured.
>
> The problem occurs when I format the array. E.g.:
> mkfs.ext2 /dev/md0
>
> This works OK and no errors are given. However when the system is rebooted,
> around half the disks now have corrupt disk labels. If I re-create the disk
> labels and restore the partition tables, everything is fine when I reboot.
> The array is started correctly and the disk labels are maintained on
> subsequent reboots. Only formatting the array causes the problem.
>
> I have tried with other filing systems and the same happens. Not all the disks
> are affected, only around half of them (the last time I did it, sd[efghi]
> were affected).
>
> I'd be interested to know if anyone else seen this issue.
>
> Regards,
> David.
>
> --
> David Johnson
> www.david-web.co.uk - My Personal Website
> www.ethereye.org.uk - EtherEye Network Host Checker
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>
>
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