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 Motin
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