[Lustre-discuss] Failover / reliability using SAD direct-attached storage
Mark Hahn
hahn at mcmaster.ca
Sat Jul 23 12:06:27 PDT 2011
> It seems an external fibre
> or SAS raid is needed,
to be precise, a redundant-path SAN is needed. you could do it with
commodity disks and Gb, or you can spend almost unlimited amounts on
gold-plated disks, FC switches, etc.
the range of costs is really quite remarkable, I guess O(100x).
compare this to cars where even VERY nice production cars are only
a few times more expensive than the most cost-effective ones.
> as the idea of loosing the file system if one
> node goes down doesn't seem good, even if temporary.
how often do you expect nodes to fail, and why?
regards, mark hahn.
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