Date: Wed, 29 Sep 2010 21:20:48 -0400 From: Dan Langille <dan@langille.org> To: Artem Belevich <fbsdlist@src.cx> Cc: freebsd-stable@freebsd.org Subject: Re: zfs send/receive: is this slow? Message-ID: <4CA3E5F0.7000603@langille.org> In-Reply-To: <AANLkTikb-uw25UJYT8bt_qWshRmz%2B=FcNzkSZt_eAe4q@mail.gmail.com> References: <a263c3beaeb0fa3acd82650775e31ee3.squirrel@nyi.unixathome.org> <AANLkTikb-uw25UJYT8bt_qWshRmz%2B=FcNzkSZt_eAe4q@mail.gmail.com>
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On 9/29/2010 3:57 PM, Artem Belevich wrote: > On Wed, Sep 29, 2010 at 11:04 AM, Dan Langille<dan@langille.org> wrote: >> It's taken about 15 hours to copy 800GB. I'm sure there's some tuning I >> can do. >> >> The system is now running: >> >> # zfs send storage/bacula@transfer | zfs receive storage/compressed/bacula > > Try piping zfs data through mbuffer (misc/mbuffer in ports). I've > found that it does help a lot to smooth out data flow and increase > send/receive throughput even when send/receive happens on the same > host. Run it with a buffer large enough to accommodate few seconds > worth of write throughput for your target disks. Thanks. I just installed it. I'll use it next time. I don't want to interrupt this one. I'd like to see how long it takes. Then compare. > Here's an example: > http://blogs.everycity.co.uk/alasdair/2010/07/using-mbuffer-to-speed-up-slow-zfs-send-zfs-receive/ That looks really good. Thank you. -- Dan Langille - http://langille.org/
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