Date: Mon, 19 Sep 2011 14:06:02 -0500 (CDT) From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> To: Jason Usher <jusher71@yahoo.com> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS obn FreeBSD hardware model for 48 or 96 sata3 paths... Message-ID: <alpine.GSO.2.01.1109191403020.7097@freddy.simplesystems.org> In-Reply-To: <1316458811.88701.YahooMailClassic@web121208.mail.ne1.yahoo.com> References: <1316458811.88701.YahooMailClassic@web121208.mail.ne1.yahoo.com>
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On Mon, 19 Sep 2011, Jason Usher wrote: > > Hmmm... I understand this, but is there not any data that might > transfer from multiple magnetic disks, simultaneously, at 6GB, that > could periodically max out the card bandwidth ? As in, all drives > in a 12 drive array perform an operation on their built-in cache > simultaneously ? The best way to deal with this is by careful zfs pool design so that disks that can be expected to perform related operations (e.g. in same vdev) are carefully split across interface cards and I/O channels. This also helps with reliability. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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