We had a drive failure on a RAID5 (LSI MegaRaid SATA 150-4) volume in
our server (OpenBSD 4.1/x86). The hot spare kicked in and the volume
rebuilt fine after a successful fsck in single user mode. We put in a
new drive as the new hot spare:
# bioctl -Div ami0
bioctl: cookie = 0xd2a23c10
bio_inq
bio_inq { 0xd2a23c10, ami0, 2, 4 }
Volume Status Size Device
ami0 0 Online 501991079936 sd0 RAID5
0 Online 250995539968 0:0.0 noencl <Maxtor
6V250F0 VA11>
'V594LE9G'
1 Online 250995539968 0:1.0 noencl <Maxtor
6V250F0 VA11>
'V5075JVG'
2 Online 250995539968 0:3.0 noencl <Maxtor
6V250F0 VA11>
'V5064EEG'
ami0 1 Hot spare 250053918720 0:2.0 noencl <WDC
WD2500AAKS-00VSA01.0>
' WD-WMART1158126'
#
The thing is the hot spare is fractionally smaller than the other
drives, which is what happens when you go into a shop and ask for a
250G drive. What's going to happen if another drive fails and the
RAID array tries to rebuild onto the slightly smaller hot spare? Will
it explode or just error out? Do we need to go back and put a
slightly larger drive in?
I know this isn't the ideal place to ask the question but I figure we
can't be the only people running LSI cards under OpenBSD. So far I
can't find any good references on the 'net but my logic and intuition
tells me that the drive needs to be bigger...
G.
--
Being drunk is feeling sophisticated without being able to say it.
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