Date: Mon, 8 Feb 2010 15:56:35 +0200 From: Dan Naumov <dan.naumov@gmail.com> To: =?ISO-8859-1?Q?Gerrit_K=FChn?= <gerrit@pmp.uni-hannover.de> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: one more load-cycle-count problem Message-ID: <cf9b1ee01002080556s4d6cc981sf17106692da701da@mail.gmail.com> In-Reply-To: <20100208145504.762eaa7b.gerrit@pmp.uni-hannover.de> References: <cf9b1ee01002080543m7a403a6ej1f25b88c47f18c68@mail.gmail.com> <20100208145504.762eaa7b.gerrit@pmp.uni-hannover.de>
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2010/2/8 Gerrit K=FChn <gerrit@pmp.uni-hannover.de>: > On Mon, 8 Feb 2010 15:43:46 +0200 Dan Naumov <dan.naumov@gmail.com> wrote > about RE: one more load-cycle-count problem: > > DN> >Any further ideas how to get rid of this "feature"? > > DN> 1) The most "clean" solution is probably using the WDIDLE3 utility on > DN> your drives to disable automatic parking or in cases where its not > DN> possible to complete disable it, you can adjust it to 5 minutes, whic= h > DN> essentially solves the problem. Note that going this route will > DN> probably involve rebuilding your entire array from scratch, because > DN> applying WDIDLE3 to the disk is likely to very slightly affect disk > DN> geometry, but just enough for hardware raid or ZFS or whatever to bar= k > DN> at you and refuse to continue using the drive in an existing pool (th= e > DN> affected disk can become very slightly smaller in capacity). Backup > DN> data, apply WDIDLE3 to all disks. Recreate the pool, restore backups. > DN> This will also void your warranty if used on the new WD drives, > DN> although it will still work just fine. > > Thanks for the warning. How on earth can a tool to set the idle time > affect the disk geometry?! WDIDLE3 changes the drive firmware. This is also how WD can detect you've used it on your disk and void your warranty accordingly :) - Sincerely, Dan Naumov
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