one more load-cycle-count problem

Dan Naumov dan.naumov at gmail.com
Mon Feb 8 13:56:37 UTC 2010


2010/2/8 Gerrit Kühn <gerrit at pmp.uni-hannover.de>:
> On Mon, 8 Feb 2010 15:43:46 +0200 Dan Naumov <dan.naumov at 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, which
> 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 bark
> DN> at you and refuse to continue using the drive in an existing pool (the
> 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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