Re: RAID Recovery...

["d n" <d n collab net>]

I'm in a similar situation as far as wanting to be able to rebuild a
RAID-1 mirror with only one mirror intact.  Logic tells me I should be
able to do so, but all documentation I've seen refers to a minimum of
three mirrors needed (two intact) before you can rebuild a failed
mirror.  I deliberately failed a RAID-1 pair of mine and tried to rebuild
with no success, but lack of docs might have prevented me from doing what
I needed to...

This seems really silly, and I am hoping very hard that someone posts the
miracle answer to this list.  But at minimum, RAID-1 still protects me
from a spindle failure causing the box to go down... at worst a single
spindle failing will cause me to have to rebuild the box at some point,
but it will be at my leisure, not right away in a frenzied scramble to
bring a box back up.



On Fri, 1 Sep 2000, James Q. Stansfield wrote:

> 
> 	Okay here's the situation... We built a RedHat 6.2 system with two 9.1Gb
> SCSI HDs, each on their own controller and created RAID 1 partitions for
> each of the partitions we were using (Swap, /boot, /). RH installed no
> problems. Everything worked as advertised. I was very surprised to see RAID
> working so easily on Linux, and am now considering doing it for myself at
> home. Our network admin wanted to test the RAID recovery. So we powered down
> Linux, removed one of the drives to simulate a failed HD and booted. Linux
> didn't skip a beat. It asked us if we wanted to change the configuration
> since we were now missing a drive. We said 'Do Nothing' as we thought that
> was the way to go, keep our configuration and the like. So now we've
> reattached the original drive (after formatting it...) and want to rebuild
> the array.
> 	This is my pet peeve about Linux, the documentation is crap. Everything I
> can find about RAID, HOWTO's etc, seem to deal with older version of the
> software since I find my version of mkraid doesn't support the command line
> options that are listed in the HOWTO...
> 	Unfortunately I started the procedure before I realized this shortcoming
> with the docs.
> 	I booted into linux single.
> 	umounted /boot
> 	raidstop(ed) it...
> 	and now I'm stuck. I can't use mkraid since the version is obviously
> different than the one that I can find docs for...
> 	raidstart won't work as it tells me that /dev/md0(what was /boot) is an
> invalid argument
> 	Now I'm afraid to reboot the box because as far I I believe the raid isn't
> working on /boot anymore and my system won't come up now unless I use the
> floppy...
> 	Anyone have any ideas, or can point me to up-to-date docs for RAID under
> RH6.2?
> 
> 	James Q. Stansfield
> 	Web Developer
> 	Trader Media Corporation
> 	(416)789-3311 x3249
> 	[jstansfield trader ca]
> 
> 
> 
> _______________________________________________
> Redhat-install-list mailing list
> Redhat-install-list redhat com
> https://listman.redhat.com/mailman/listinfo/redhat-install-list
> 

-- 
d n shick				collab.net
cognitive dissonator			http://www.collab.net

Reality is that which, when you stop believing in it,
doesn't go away.  		- Philip K. Dick