[Beowulf] Lustre failover
hahn at mcmaster.ca
Wed Sep 10 10:34:45 EDT 2008
>> active/active seems strange to me - it implies that the bottleneck
>> is the OSS (OST server), rather than the disk itself. and a/a means
>> each OSS has to do more locking for the shared disk, which would seem
>> to make the problem worse...
> No, you can do active/active with several systems
> / \
> OSS1 OSS2
> \ /
> (Raid1 and Raid2 are hardware raid systems).
> Now OSS1 will primarily serve Raid1 and OSS2 will primarily serve Raid2. So
yes, I know - that's how HP SFS is set up. the OP was talking active-active,
though, meaning that IO at any instant can go to either OSS and still make
it onto a particular raid. otherwise it's active/passive, what SFS does.
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