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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