Date: Mon, 8 Feb 2010 16:35:46 -0800 From: Freddie Cash <fjwcash@gmail.com> To: freebsd-stable@freebsd.org Subject: Re: one more load-cycle-count problem Message-ID: <b269bc571002081635p7bac2de6j210f21af7bdf1810@mail.gmail.com> In-Reply-To: <201002091059.28625.doconnor@gsoft.com.au> References: <cf9b1ee01002080543m7a403a6ej1f25b88c47f18c68@mail.gmail.com> <201002091059.28625.doconnor@gsoft.com.au>
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On Mon, Feb 8, 2010 at 4:29 PM, Daniel O'Connor <doconnor@gsoft.com.au>wrote: > On Tue, 9 Feb 2010, Dan Naumov wrote: > > 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. > > Errm.. Why would it change the geometry? > > I have used this tool to change the settings on all my disks and it did > not in any way cause a problem booting later. > > My disks are WDC WD10EADS-00L5B1/01.01A01 > > (1Tb "green" disks) > > I just did this to 8 of the 1.5 TB Caviar Green disks, without ZFS complaining in any way. I did test it on a spare drive before doing it to the 7 live drives. And I did replace them while the server was turned off, just to be safe (and to prevent a resilver from occuring). wdidle3 doesn't actually disable the idle timeout on these drives. Using /d just sets the timeout to 62 minutes. Effectively the same, but don't be surprised when it continues to say "idel 3 available and enabled". :) So far, things are running much smoother. Load_Cycle_Count has stopped increasing (50,000 in 8 weeks on 1 drive). Re-silver throughput for these drives has jumped from 7 MBps to over 40 MBps (90% full pool, so it's slower than normal right now, which is why we're swapping these drive into the pool). -- Freddie Cash fjwcash@gmail.com
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