Followup to: <[EMAIL PROTECTED]>
By author: David Kewley <[EMAIL PROTECTED]>
In newsgroup: linux.dev.raid
>
> Mike Tran wrote on Monday 04 April 2005 12:28:
> > We (EVMS team) intended to support RAID6 last year. But as we all
> > remember RAID6 was not stable then. I may write a plugin to support
> > RAID6 soon.
>
> Hi Mike,
>
> In your view, is RAID6 now considered stable? How soon might you have an
> evms
> plugin for it? ;) I'd love to use evms on my new filserver if it supported
> RAID6.
>
I can't speak for the EVMS people, but I got to stress-test my RAID6
test system some this weekend; after having run in 1-disk degraded
mode for several months (thus showing that the big bad "degraded
write" bug has been thoroughly fixed) I changed the motherboard, and
the kernel didn't support one of the controllers. And now there were
2 missing drives. Due to some bootloader problems, I ended up
yo-yoing between the two kernels a bit more than I intended to, and
went through quite a few RAID disk losses and rebuilds as a result.
No hiccups, data losses, or missing functionality. At the end of the
whole ordeal, the filesystem (1 TB, 50% full) was still quite prisine,
and fsck confirmed this. I was quite pleased :)
Oh, and doing the N-2 -> N-1 rebuild is slow (obviously), but not
outrageously so. It rebuilt the 1 TB array in a matter of
single-digit hours. CPU utilitization was quite high, obviously, but
it didn't cripple the system by any means.
-hpa
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