Date: Mon, 21 Apr 2008 12:43:25 +0100 From: Pete French <petefrench@ticketswitch.com> To: zbeeble@gmail.com Cc: stable@freebsd.org Subject: Re: Dreadful gmirror performance, though each half works fine Message-ID: <E1JnuQf-000LaE-5n@dilbert.ticketswitch.com> In-Reply-To: <5f67a8c40804181018s48b9c652p1c08193eb7af342f@mail.gmail.com>
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> I would suppose you might have to sync the mirror and then break off and > forget the local copy and then sync again. In our case, I'm not sure --- it > was awhile ago, but a number of them are also in the 'load' state --- as the > higher latency network drives would normally show a higher load. I did some benchmarking, and "load" gives me a bit better performance than "round-robin" so I've elected to use that. Haven't tried "prefer" as syncing all the drives backwards and forwards to get the preferences set seems a bit too much like hard work! When I started writing this post I was going to say that the iscsi initiator patch has fixed all my problems, and that it has run beautifully for the entire weekend with no lockups. But as I started typing this I set a large copy from the remote drive going in another window, and this now appears to have locked up :-( It's frustrating, it is *so* close to being workable with iscsi, and the performance is very good, but if it is going to keep locking up on me then I just cant use it that way :-( Thanks for all the advice though, very useful. -pete.
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