Yes, that's exactly right. The spare is set up in just that way, and
when I bring it into the array it works fine as the second disk once
the sync process is completed. The only problem is that I can't get
the server to boot off that new second disk, and that's what's
frustrating me.
On 14 Dec 2010, at 22:05, Derick Centeno wrote:
Question:
Correct me if I missed something, but wasn't the third "spare"
intended to be an exact mirror so that it could replace either the
first or second drive?
For the "spare" to be a replacement for either the first or the
second drive it also would have matched the exact partition
structure of the first two. In this particular sense the "spare" is
really no "spare" at all, but a sort of emergency last ditch fail-
safe in the event that either the first or second drive failed.
This also means that the for the RAID 1 system to function with a
fail-safe option/strategy the third drive had to be prepared
properly so that it could potentially replace any one of the other
two at any time.
Zeroing the RAID superblocks and attempting to make the Apple
partition bootable via ybin may have been mistakes; however the
strategy to dd the second (or first) drive onto the "spare" appears
reasonable.
Is it possible to reformat/restructure all three disks, using YDL,
so that function is restored?
On 12/13/10 2:37 PM, Matt Brock wrote:
Hi there.
(I posted this onto the YDL forums earlier today, so apologies to
anyone who's seen it twice.)
I've been using YDL on Xserve G5s for a couple of years now and it
does a great job. Recently I decided to rebuild one with software
RAID to get disk redundancy. I did all of this through the
installer. The server has three disks, so I set them up as RAID 1
with a spare.
This has all gone very successfully apart from one detail. The two
disks in the RAID set are bootable, i.e. I can remove either of
those disks and the machine will still boot as normal. That's fine
so far. Then I permanently removed the first disk and brought the
spare third disk into the RAID set instead. Once the RAID set is
then fully rebuilt I can boot off the original second disk, but the
third disk which was previously the spare disk is not bootable. It
gets to the first yaboot stage, and then the blue icon which
represents OpenBoot failing to find a boot disk appears
superimposed over the yaboot screen. That process just loops over
and over again and never boots.
I've tried using ybin to make the Apple boot partition bootable
with the correct yaboot config, but that didn't help. I've tried dd-
ing the entire second disk onto the third disk then zeroing the
RAID superblocks, and that didn't work. I've tried resetting the
NVRAM and that made no difference. I'm sure it's not a hardware
problem with the disk because I've tried this twice now with the
disks in different slots each time, and it's always the spare disk
which has the boot problem even though that's a different physical
disk each time.
I hope there's someone out there who can help because I'm tearing
my hair out over this. I can't see what else would be needed to
make the third disk bootable... yet there must be something!
Without getting this working the full redundancy I'd hoped for
can't be achieved, which would be extremely frustrating.
Cheers,
Matt.
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