Subject: Re: raidframe copyback blocks the whole system !?
To: Greg Oster <firstname.lastname@example.org>
From: Markus W Kilbinger <email@example.com>
Date: 06/24/2002 14:49:27
>>>>> "Greg" == Greg Oster <firstname.lastname@example.org> writes:
>> After simulating (raidctl -F) a disk failure of a 4 disk raid5
>> (3 + 1 spare), the spare disk got in 'used_spare' state and the
>> whole raid was still usable under the 'reconstructing' phase.
>> But what's the smooth way (== the system is still usable during
>> that time) back? 'raidctl -B' did the job, but blocks the whole
>> system for the complete copyback time!
Greg> It blocks the filesystem(s) on the RAID set... Unfortunatly,
Greg> this is a limitation of the copyback code.
As positive aspect copyback is about twice as fast as the
>> Trying it with 'raidctl -R ...', while the spare is in use,
>> reconstructed the formerly failed disk smoothly, but left the
>> spare disk in 'used_spare' state.
Greg> Hmm!! It really shouldn't be letting you do a 'raidctl -R'
Greg> after you've already reconstructed to a spare... smells like
Greg> a bug..
A reboot 'solved' this problem, but that's not the clean way for a
raid system, anyway! ;-)
So, copyback is the only (clean) way back from a used spare to the
normal raid disk on a running machine?