On Thursday October 5, mickg@xxxxxxxxx wrote:
> Neil Brown wrote:
> > On Wednesday October 4, mickg@xxxxxxxxx wrote:
> >> I have been trying to run:
> >> mdadm --grow /dev/md0 --raid-devices=6 --backup-file /backup_raid_grow
> >> I get:
> >> mdadm: Need to backup 1280K of critical section..
> >> mdadm: /dev/md0: Cannot get array details from sysfs
> >
> > It shouldn't do that....
> > Can you
> > strace -o /tmp/trace -s 300 mdadm --grow .....
...
> open("/sys/block/md0/md/component_size", O_RDONLY) = -1 ENOENT (No such file or directory)
So it couldn't open .../component_size. That was added prior to the
release of 2.6.16, and you are running 2.6.17.13 so the kernel
certainly supports it.
Most likely explanation is that /sys isn't mounted.
Do you have a "/sys"?
Is it mounted?
Can you "ls -l /sys/block/md0/md" ??
Maybe you need to
mkdir /sys
mount -t sysfs sysfs /sys
and try again.
NeilBrown
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