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From: "Steven Hartland" <killing@multiplay.co.uk>
To: "Nicolas Rachinsky" <fbsd-mas-0@ml.turing-complete.org>
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Subject: Re: slowdown of zfs (tx->tx)
Date: Mon, 14 Jan 2013 00:05:54 -0000
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----- 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.

Its not something silly like you have 4k disks which aren't 4k aligned
is it?

IIRC you where using rsync, is there a reason why you aren't using
zfs send - recv?


    Regards
    Steve

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