[Beowulf] Software RAID?
smulcahy at aplpi.com
Thu Nov 22 09:54:37 EST 2007
Joe Landman wrote:
> RAID10 is not that hard in software, the hotswap is harder. Cold-swap
> *may* be possible (last I looked it should work, haven't tried it
> recently on SATA). The issue is whether or not the driver drags the
> kernel screaming and kicking into a kernel panic when a device is
> removed ...
Last time I worked on a system with software RAID on Linux was 2 or 3
years ago. At the time, the server using it experienced a drive failure
and on reboot - the system got confused about which disk was which and
tried to mount a different disk from another RAID set.
I'm uncertain of how exactly it was configured on that server and
whether it was a misconfiguration in the RAID config or a failure in the
RAID driver that caused the confusion - but it set me back a few years
in terms of trusting software RAID.
I'm nearly ready to trust it again - I assume it's a little more robust
these days and handles single drive failures robustly? I suppose the
suggestion that cold-swap *may* be possible scared me a little there
-stephen, hugging his 3ware hw raid card
Stephen Mulcahy, Applepie Solutions Ltd., Innovation in Business Center,
GMIT, Dublin Rd, Galway, Ireland. +353.91.751262 http://www.aplpi.com
Registered in Ireland, no. 289353 (5 Woodlands Avenue, Renmore, Galway)
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