Date: Mon, 14 Jan 2013 10:43:45 +0100 From: Nicolas Rachinsky <fbsd-mas-0@ml.turing-complete.org> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: slowdown of zfs (tx->tx) Message-ID: <20130114094345.GB75529@mid.pc5.i.0x5.de> In-Reply-To: <778BCD159C6546A4ADC7D9FBBFC3DA8A@multiplay.co.uk> References: <20130108174225.GA17260@mid.pc5.i.0x5.de> <CAFqOu6jgA8RWV5d%2BrOBk8D=3Vu3yWSnDkAi1cFJ0esj4OpBy2Q@mail.gmail.com> <20130109162613.GA34276@mid.pc5.i.0x5.de> <CAFqOu6jrng=v8eVyhqV-PBqJM_dYy%2BU7X4%2B=ahBeoxvK4mxcSA@mail.gmail.com> <20130110193949.GA10023@mid.pc5.i.0x5.de> <20130111111147.GA34160@mid.pc5.i.0x5.de> <C3BE7751389046ED8A03C8EA9699A76B@multiplay.co.uk> <20130113235239.GA16318@mid.pc5.i.0x5.de> <778BCD159C6546A4ADC7D9FBBFC3DA8A@multiplay.co.uk>
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* Steven Hartland <killing@multiplay.co.uk> [2013-01-14 00:05 -0000]:
>
> ----- Original Message ----- From: "Nicolas Rachinsky"
> <fbsd-mas-0@ml.turing-complete.org>
> To: "Steven Hartland" <killing@multiplay.co.uk>
> Cc: "freebsd-fs" <freebsd-fs@freebsd.org>
> Sent: Sunday, January 13, 2013 11:52 PM
> Subject: Re: slowdown of zfs (tx->tx)
>
>
> >* Steven Hartland <killing@multiplay.co.uk> [2013-01-11 13:58 -0000]:
> >>TBH looks like your just saturating your disks with the number of IOP's
> >>your doing.
> >
> >But now a backup takes forever (16hours and more) that took less than
> >30 minutes two weeks ago.
> >
> >I duplicated the complete setup to another (slower) server. There the
> >backups are slower than they were on this machine, but they are much
> >faster than on this machine.
^they are ^now
>
> Its not something silly like you have 4k disks which aren't 4k aligned
> is it?
No, these are 512 bytes/sector disks. And it started to become so slow
without any change (hardware or software).
> IIRC you where using rsync, is there a reason why you aren't using
> zfs send - recv?
Most of the machines whose backups are put to this machine run with
linux and don't have zfs.
Nicolas
--
http://www.rachinsky.de/nicolas
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