[Linux-HA] hardware fencing / serveraid
alanr at unix.sh
Tue Mar 23 10:32:16 MST 2004
Jan-Frode Myklebust wrote:
> I'm looking a buying some new hardware for a HA-NFS cluster, and am
> wondering what the safest hardware would be. The IBM ServeRAID seems
> to be a good choice (since it has hardware fencing), but the ServeRAID
> resource script says that it's only supported in RAID-1 mode.
RAID 1, 1e, 10, etc. Nothing that has a "5" in it ;-)
The adapter will allow you to configure it with RAID 5 in clustering mode -
but certain error recover cases are not properly handled. Therefore it's
not a configuration which I feel comfortable recommending. The script
specifically disallows it because it worries me. It's not a likely
condition, but it's far from impossible.
> What about non-RAID mode? Will it not work if I connect two
> ServeRAID-adapters to a single SCSI disk (or hardware RAID)?
I think it wants some kind of RAID. HA seems to me to imply some kind of
RAID for disk.
Alan Robertson <alanr at unix.sh>
"Openness is the foundation and preservative of friendship... Let me claim
from you at all times your undisguised opinions." - William Wilberforce
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