Date: Wed, 23 Jan 2013 22:44:44 +0000 From: Steven Chamberlain <steven@pyro.eu.org> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: freebsd-fs <freebsd-fs@freebsd.org>, Mark Felder <feld@feld.me>, Chris Rees <utisoft@gmail.com> Subject: Re: ZFS regimen: scrub, scrub, scrub and scrub again. Message-ID: <510067DC.7030707@pyro.eu.org> In-Reply-To: <alpine.BSF.2.00.1301232240200.2067@wojtek.tensor.gdynia.pl> References: <CACpH0Mf6sNb8JOsTzC%2BWSfQRB62%2BZn7VtzEnihEKmEV2aO2p%2Bw@mail.gmail.com> <alpine.BSF.2.00.1301211201570.9447@wojtek.tensor.gdynia.pl> <20130122073641.GH30633@server.rulingia.com> <alpine.BSF.2.00.1301232121430.1659@wojtek.tensor.gdynia.pl> <CADLo838Rst7wEtV7DpY23XjpcFCsOkrN=axE1AscyO7vYgSKSg@mail.gmail.com> <op.wrdudwx334t2sn@markf.office.supranet.net> <CAFqOu6gcvTEYCtLEUoyd4tX7acrk=V85u4EuNiDWVj4X%2B0Dcpg@mail.gmail.com> <alpine.BSF.2.00.1301232240200.2067@wojtek.tensor.gdynia.pl>
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On 23/01/13 21:40, Wojciech Puchar wrote: >> "1 drive in performance" only applies to number of random i/o >> operations vdev can perform. You still get increased throughput. I.e. >> 5-drive RAIDZ will have 4x bandwidth of individual disks in vdev, but > > unless your work is serving movies it doesn't matter. That's why I find it really interesting the Netflix Open Connect appliance didn't use ZFS - it would have seemed perfect for that application. http://lists.freebsd.org/pipermail/freebsd-stable/2012-June/068129.html Instead there are plain UFS+J filesystems on some 36 disks and no RAID - it tries to handle almost everything at the application layer instead. I'm sure it's worked out okay for them, but wonder how much easier it would be if they could push content updates out with a 'zfs send', without having to take the machine offline. If split into a few large RAID-Zs a disk could stay in use even when a few blocks have failed. Regards, -- Steven Chamberlain steven@pyro.eu.org
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