High availability ... again
morgan at orst.edu
Tue Jun 22 13:58:59 EDT 2004
On Tue, 22 Jun 2004, Etienne Goyer wrote:
> Tore Anderson word of wisdom where :
> > There's a third option, which is the one I prefer the most: shared
> > block device.
> Well, I did not consider that option since the SAN become a single
> point-of-failure, and that is a big no-no according to the
> specifications I have at the moment.
> If it would have been possible, it would have been my first choice though.
Most SANs are not single points of failure, unless you consider the whole
SAN catching fire a single point of failure. A properly designed SAN can
have complete hardware redundancy, so unless you commit some
administrator error... :)
We have a SAN that we use for user home directories here built from Sun T3
Enterprise pairs. It uses RAID 5 for disk redundancy, has two FC
controllers that can failover to each other, has redundant FC links to a
pair of FC switches, and the server has redundant FC links to the
We've had both disks and controllers fail without even a hiccup, and we've
even added more storage to the SAN *and* expanded the file system on the
fly. Veritas Volume Manager and File System are wonderful.
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