Date: Tue, 26 Jan 2010 19:12:01 -0500 From: Damian Gerow <dgerow@afflictions.org> To: freebsd-stable@freebsd.org Subject: Re: immense delayed write to file system (ZFS and UFS2), performance issues Message-ID: <20100127001201.GE9206@plebeian.afflictions.org> In-Reply-To: <20100126235458.GA12634@swelter.hanley.stade.co.uk> References: <cf9b1ee01001261515n72f32265tf8dd0da5c8a3ec3c@mail.gmail.com> <20100126235458.GA12634@swelter.hanley.stade.co.uk>
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Adrian Wontroba wrote: : How about using the "write every 5 seconds" python script posted earlier : in this thread by erik@tefre.com? Works nicely for me and stops the load : cycle count increase. I have a WD2003FYPS sitting in a system, to be used for testing. Bought it just before this thread started, and here's what it looks like right now: 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 508 193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 2710 This drive is sitting, unused, with no filesystem, and I've performed approximately zero writes to the disk. Having a script kick off and write to a disk will help so long as that disk is writable; if it's being used as a hot spare in a raidz array, it's not going to help much.
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