On Tue, Oct 29, 2002 at 12:59:32PM -0600, Simpson, Doug wrote:
> I have set up a (software) RAID-1 (mirroring two drives) with RH
> 7.3.  Setup was easy but I want to test it.  I cannot find this
> info.  Can someone point me in the right direction or give me some
> info on recovery using software raid on a RH 7.3 box?

This part of software raid is tricky, I discovered.

I was one day sitting at my basement server, burning a CD when one of
my raid 1 died in the midst of a DMA.  I never knew there was a
problem until the next morning when I got an e-mail from a cron job I
have telling me that /proc/mdstat had changed.  I now trust that Linux
software raid 1 can survive a disk dying without bringing down the
machine.  Note: I have my swap on a raid partition too.

The trickier part is rebooting if hda dies and the bios/lilo don't
understand how to boot from hdc.  I have not figured this out yet.  I
suggest you do some testing.

Boot off a CD and blow away the partition table on one of your disks
and see if it will boot off the other.  If it does, re-partition that
disk again and add it to the array.  Then do the same thing to the
other disk.

If either disk can boot and you can restore the other in both cases,
then I think you are ready for prime time.


-kb, the Kent who is behind on this score and still have some work to
do.



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