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
Raid1
/ \
OSS1 OSS2
\ /
Raid2
(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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