On 01/20/12 10:09, Nikolay Denev wrote: > Another thing I've observed is that active/active probably only makes sense if you are accessing single LUN. > In my tests where I have 24 LUNS that form 4 vdevs in a single zpool, the highest performance was achieved > when I split the active paths among the controllers installed in the server importing the pool. (basically "gmultipath rotate $LUN" in rc.local for half of the paths) > Using active/active in this situation resulted in fluctuating performance. How big was fluctuation? Between speed of one and all paths? Several active/active devices without knowledge about each other with some probability will send part of requests via the same links, while ZFS itself already does some balancing between vdevs. -- Alexander MotinReceived on Fri Jan 20 2012 - 09:52:01 UTC
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