Re: Manually fail a disk?

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>   I've got a disk that's starting to fail hard.  It's generating alot of
> errors in dmesg and /var/log/messages.  If the raid disk gets any usage
> it'll lock up the box it's spewing errors so fast.  I can't get out to
> physically yank the disk until Tues but need it off-lined now.  Is there
> a way to tell mdtools (version 0.42-33) to mark a disk faulty and not
> use it?

I'll assume this is a RAID-1 or RAID-5 and that you're not trying this on
a non-redundant array...


# mdadm /dev/md0 --fail /dev/sda1
# mdadm /dev/md0 --remove /dev/sda1

The first command fails /dev/sda1 (a member of /dev/md0) and the second
command removes it from /dev/md0.

If you are using raidtools try:

# raidsetfaulty /dev/md0 /dev/sda1
# raidhotremove /dev/md0 /dev/sda1

--
Derek Vadala, derek@cynicism.com, http://www.cynicism.com/~derek

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