From owner-freebsd-stable@FreeBSD.ORG Mon Apr 21 11:43:28 2008 Return-Path: Delivered-To: stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5C899106566C for ; Mon, 21 Apr 2008 11:43:28 +0000 (UTC) (envelope-from petefrench@ticketswitch.com) Received: from angel.ticketswitch.com (angel.ticketswitch.com [IPv6:2002:57e0:1d4e::1]) by mx1.freebsd.org (Postfix) with ESMTP id 182D68FC20 for ; Mon, 21 Apr 2008 11:43:28 +0000 (UTC) (envelope-from petefrench@ticketswitch.com) Received: from [10.50.50.2] (helo=smaug.rattatosk) by angel.ticketswitch.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.69 (FreeBSD)) (envelope-from ) id 1JnuQf-0006LY-9G; Mon, 21 Apr 2008 12:43:25 +0100 Received: from dilbert.rattatosk ([10.50.50.6] helo=dilbert.ticketswitch.com) by smaug.rattatosk with esmtp (Exim 4.69 (FreeBSD)) (envelope-from ) id 1JnuQf-000P4B-6h; Mon, 21 Apr 2008 12:43:25 +0100 Received: from petefrench by dilbert.ticketswitch.com with local (Exim 4.69 (FreeBSD)) (envelope-from ) id 1JnuQf-000LaE-5n; Mon, 21 Apr 2008 12:43:25 +0100 To: zbeeble@gmail.com In-Reply-To: <5f67a8c40804181018s48b9c652p1c08193eb7af342f@mail.gmail.com> Message-Id: From: Pete French Date: Mon, 21 Apr 2008 12:43:25 +0100 Cc: stable@freebsd.org Subject: Re: Dreadful gmirror performance, though each half works fine X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Apr 2008 11:43:28 -0000 > 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.