On Sat, August 22, 2009 4:14 pm, Info@quantum-sci.net wrote:

Not able to boot to my RAID devices.  md0 is / and ext3 RAID1, but md1 and
md2 are swap and JFS respectively, RAID10 created like this:
mdadm --create /dev/md1 --level=raid10 --layout=o2 --metadata=1.2
--chunk=256 --raid-disks=2 missing /dev/sdb2

It gives the initial kernel boot message but then says
invalid raid superblock magic on sdb2
invalid raid superblock magic on sdb3

... and halts progress.  I have to hard-reset to continue.  Why isn't the
error more specific?

You say md0 is raid1 but mdstat shows it to be raid10, so that won't boot.

'raid autodetect' only works for 0.90 metadata, and you are using 1.x.
You should not use 'raid autodetect' partitions.  Rather the initrd
should use mdadm to assemble the arrays.  Most distros seem to get this
right these days.  Maybe you just need to rebuild your
initrd...

NeilBrown

I've tried setting the metadata to 1.1, and tried adjusting mdadm.conf
from /dev/md/1 to /dev/md1, but neither helped.  The parts are set to raid
autodetect and the kernel parameter is set to md_autodetect.  What could
be wrong?



On Friday 21 August 2009 12:20:28 Info@quantum-sci.net wrote:

quoted

My God, the command is not working.  I need to remove sdb1 from md0 so I
can change it from a RAID10 to RAID1, and it simply ignores my command:
# mdadm /dev/md0 --fail /dev/sdb1 --remove /dev/sdb1
# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5]
[raid4] [multipath]
md2 : active raid10 sdb3[1]
      1868560128 blocks super 1.2 64K chunks 2 offset-copies [2/1] [_U]
      bitmap: 94/446 pages [376KB], 2048KB chunk

md1 : active raid10 sdb2[1]
      6297344 blocks super 1.2 64K chunks 2 offset-copies [2/1] [_U]
      bitmap: 0/25 pages [0KB], 128KB chunk

md0 : active raid10 sdb1[1]
      78654080 blocks super 1.2 64K chunks 2 offset-copies [2/1] [_U]
      bitmap: 76/151 pages [304KB], 256KB chunk

unused devices: <none>
#


My system is half-converted and is now unbootable.  What am I going to
do?

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