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Date:      Wed, 12 Jun 2013 17:57:13 +0200
From:      Borja Marcos <borjam@sarenet.es>
To:        Jeremy Chadwick <jdc@koitsu.org>
Cc:        freebsd-fs@freebsd.org
Subject:   Re: An order of magnitude higher IOPS needed with ZFS than UFS
Message-ID:  <8FF3DAC5-ED3D-4678-B040-74829A208A86@sarenet.es>
In-Reply-To: <20130612114937.GA13688@icarus.home.lan>
References:  <51B79023.5020109@fsn.hu> <op.wykdduw834t2sn@markf.office.supranet.net> <20130612114937.GA13688@icarus.home.lan>

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On Jun 12, 2013, at 1:49 PM, Jeremy Chadwick wrote:

> Mark, do you have any references for this?  I'd love to learn/read =
more
> about this engineering/design aspect (I won't say flaw, I'll just say
> aspect) to ZFS, as it's the first I've heard of it.

I have seen that behavior with standard hard disks. Once the busy space =
reached 80 % performance
dropped significantly. Just deleting some old data (it is a log storage =
system) performance went
back to normal.

Sorry I don't have graphs or anything like that. What I noticed is that =
the disks were
"busier" per the %busy column in gstat(8).





Borja.




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