Marcin Krol wrote:
Tuesday 05 February 2008 21:12:32 Neil Brown napisał(a):
% mdadm --zero-superblock /dev/sdb1
mdadm: Couldn't open /dev/sdb1 for write - not zeroing
That's weird.
Why can't it open it?
Hell if I know. First time I see such a thing.
Maybe you aren't running as root (The '%' prompt is suspicious).
I am running as root, the "%" prompt is the obfuscation part (I have
configured bash to display IP as part of prompt).
Maybe the kernel has been told to forget about the partitions of
/dev/sdb.
But fdisk/cfdisk has no problem whatsoever finding the partitions .
mdadm will sometimes tell it to do that, but only if you try to
assemble arrays out of whole components.
If that is the problem, then
blockdev --rereadpt /dev/sdb
I deleted LVM devices that were sitting on top of RAID and reinstalled mdadm.
% blockdev --rereadpt /dev/sdf
BLKRRPART: Device or resource busy
% mdadm /dev/md2 --fail /dev/sdf1
mdadm: set /dev/sdf1 faulty in /dev/md2
% blockdev --rereadpt /dev/sdf
BLKRRPART: Device or resource busy
% mdadm /dev/md2 --remove /dev/sdf1
mdadm: hot remove failed for /dev/sdf1: Device or resource busy
lsof /dev/sdf1 gives ZERO results.
What does this say:
dmsetup table
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