Re: Manually fail a disk?

["Robert L. Harris" <Robert.L.Harris@rdlg.net>]

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raidsetsetfaulty gave back an error (scrolled off the screen and the
machine has since seized up.  raidhotremove pretty much hung up trying
to get disk access.  I was hoping I could tell the kernel or the md
driver to mark it bad and take it out of the array.


Thus spake Derek Vadala (derek@cynicism.com):

> >   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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:wq!
---------------------------------------------------------------------------
Robert L. Harris                     | PGP Key ID: FC96D405
                               
DISCLAIMER:
      These are MY OPINIONS ALONE.  I speak for no-one else.
FYI:
 perl -e 'print $i=pack(c5,(41*2),sqrt(7056),(unpack(c,H)-2),oct(115),10);'


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