On 1/9/2011 16:57, NeilBrown wrote:
Simply running
mdadm --zero-superblock /dev/sdb
should fix it.
Well, that doesn't work very well: "mdadm: Couldn't open /dev/sdb for write
- not zeroing" ... strace reveals that mdadm is trying to open it O_EXCL,
which I presume is why it's not working ... I presume I'd have to reboot to
single user mode and stop the LVM and possibly MD stuff in order for that to
work, which might then require booting from a rescue cd to do it.
So I backed up the contents of the end of the disk in case I screwed up, and
then zerro'd it with dd (nervous nervous). I double-checked things with
mdadm --examine to double-check I had cleared the stray superblock and not
damaged the one in sdb3, and that looks OK
After doing that, the version of grub-probe that was crashing before appears
to work properly, and the trunk version of grub-probe no longer spits out
the warning/error. I then upgraded the debian package to the latest version
in testing (since I'd been using an old version where I could work around
the problems), and let it run the grub-install on all 4 disks, and that
proceeded without errors. Hooray :)
Thank you folks for your help solving this!
--
-Matt
"Reality is that which, when you stop believing in it, doesn't go away".
-- Philip K. Dick
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