Date: Tue, 26 Jan 2010 19:49:05 -0500 From: Damian Gerow <dgerow@afflictions.org> To: Dan Naumov <dan.naumov@gmail.com> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: immense delayed write to file system (ZFS and UFS2), performance issues Message-ID: <20100127004905.GF9206@plebeian.afflictions.org> In-Reply-To: <cf9b1ee01001261645jdd80be0kaea905508cf5bd49@mail.gmail.com> References: <cf9b1ee01001261645jdd80be0kaea905508cf5bd49@mail.gmail.com>
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Dan Naumov wrote: : >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. : : I wouldn't worry in your particular case. A value of 2710 in 508 hours : is a rate of 5,33/hour. At this rate, it's going to take you 56285 : hours or 2345 days to reach 300,000 and most disks will likely : function past 400,000 (over 600,000 all bets are off though). The : people who need(ed) to worry were people like me, who were seeing the : rate increase at a rate of 43+ per hour. Which is why I haven't spoken up on the thread -- I'm not terribly worried. Specific cases aside, writing to the FS is a workaround to a rather inconvenient issue. I, too, would like to see if the problem is fixed, not avoided, by using wdidle -- but I suspect I'll have to contact WD myself to get that confirmation.
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