Date: Mon, 19 Sep 2011 08:48:08 -0500 (CDT) From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> To: Peter Jeremy <peterjeremy@acm.org> Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: ZFS obn FreeBSD hardware model for 48 or 96 sata3 paths... Message-ID: <alpine.GSO.2.01.1109190845110.1567@freddy.simplesystems.org> In-Reply-To: <20110919094013.GA7771@server.vk2pj.dyndns.org> References: <1316222526.31565.YahooMailNeo@web121205.mail.ne1.yahoo.com> <20110919094013.GA7771@server.vk2pj.dyndns.org>
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On Mon, 19 Sep 2011, Peter Jeremy wrote: > > ZIL will only be useful if you do lots of sync writes. L2ARC won't > help write performance. Heavy write load implies you want mirroring L2ARC can substantially help write performance in the case where a partial block is updated. It avoids the 'read' part of the read/modify/write cycle. Of course it only helps if the L2ARC is much more responsive than the main store. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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