Date: Mon, 8 Feb 2010 15:43:46 +0200 From: Dan Naumov <dan.naumov@gmail.com> To: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: RE: one more load-cycle-count problem Message-ID: <cf9b1ee01002080543m7a403a6ej1f25b88c47f18c68@mail.gmail.com>
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>Any further ideas how to get rid of this "feature"? You have several options. 1) The most "clean" solution is probably using the WDIDLE3 utility on your drives to disable automatic parking or in cases where its not possible to complete disable it, you can adjust it to 5 minutes, which essentially solves the problem. Note that going this route will probably involve rebuilding your entire array from scratch, because applying WDIDLE3 to the disk is likely to very slightly affect disk geometry, but just enough for hardware raid or ZFS or whatever to bark at you and refuse to continue using the drive in an existing pool (the affected disk can become very slightly smaller in capacity). Backup data, apply WDIDLE3 to all disks. Recreate the pool, restore backups. This will also void your warranty if used on the new WD drives, although it will still work just fine. 2) A less clean solution would be to setup a script that polls the SMART data of all disks affected by the problem every 8-9 seconds and have this script launch on boot. This will keep the affected drives just busy enough to not park their heads. - Sincerely, Dan Naumov
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