Date: Mon, 22 Jun 2015 23:29:21 -0400 From: Quartz <quartz@sneakertech.com> To: kpneal@pobox.com Cc: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Re: ZFS raid write performance? Message-ID: <5588D291.4030806@sneakertech.com> In-Reply-To: <20150623002854.GB96928@neutralgood.org> References: <5587C3FF.9070407@sneakertech.com> <5587C97F.2000407@delphij.net> <55887810.3080301@sneakertech.com> <20150622221422.GA71520@neutralgood.org> <55888E0D.6040704@sneakertech.com> <20150623002854.GB96928@neutralgood.org>
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>> I guess a better way to word the question is: would a raidzX using >> generic drives, samba, and 500mb-4gb files be notably slower at writing >> than ~70mb/sec. I have a feeling not, but I wanted to double check. > > Gut feeling: I'm sticking with the network being the limiting factor. > But the only real way to know is to setup a test system and, well, test. Question: I'm not super familiar with the way freebsd+zfs handles IO and caching under the hood, especially not when you throw drive caching into the mix too. Does something simple like "dd if=/dev/zero of=/pool/foo bs=1m count=500" give me a reasonably accurate number for write speed?
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