Date: Wed, 31 Aug 2011 10:10:30 +0300 From: Daniel Kalchev <daniel@digsys.bg> To: freebsd-fs@freebsd.org Subject: Re: Very inconsistent (read) speed on UFS2 Message-ID: <4E5DDE66.5000508@digsys.bg> In-Reply-To: <20110831004251.GA89979@icarus.home.lan> References: <1945418039.20110830231024@serebryakov.spb.ru> <317753422.20110830231815@serebryakov.spb.ru> <20110831004251.GA89979@icarus.home.lan>
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On 31.08.11 03:42, Jeremy Chadwick wrote: > There is a possibility that one of your drives could be performing at > less-than-ideal rates (yes, intermittently) and therefore impacts > (intermittently) your overall I/O throughput. This is very probable, given RAID5, that needs to read stripes off every disc on every read. Probably some S.M.A.R.T. investigation might help (different measurements for different drives, if supported by the drives, that is). Daniel
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