On 20.01.2012, at 12:51, Alexander Motin <mav_at_freebsd.org> wrote: > 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 I will test in a bit and post results. P.S.: Is there a way to enable/disable active-active on the fly? I'm currently re-labeling to achieve that.Received on Fri Jan 20 2012 - 10:08:35 UTC
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