Date: Fri, 28 Oct 2011 10:16:42 -0500 (CDT) From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> To: Dennis Glatting <freebsd@penx.com> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS across controllers Message-ID: <alpine.GSO.2.01.1110281013500.16364@freddy.simplesystems.org> In-Reply-To: <alpine.BSF.2.00.1110280744440.18694@Elmer.dco.penx.com> References: <alpine.BSF.2.00.1110280744440.18694@Elmer.dco.penx.com>
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On Fri, 28 Oct 2011, Dennis Glatting wrote: > This seems like a stupid question but is there any significant performance > problems with a ZFS RAIDz volume served across multiple controllers? No. Available IOPS will be dominated/limited by whichever controller and disks are slowest to respond. > I have seen two cases that confuse me. First, performance degrades over time. > I have read there was previously a prefetch bug but it has been fixed. I also > recently turned off prefetching to test (no opinion yet). In what way is performance degrading? What means are you using to evaluate performance? Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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