Quick ZFS mirroring question for non-mirrored pool

[Simun Mikecin]

----- Original Message ----
> From: Jeremy Chadwick <freebsd at jdc.parodius.com>
> To: Kaya Saman <SamanKaya at netscape.net>
> Cc: freebsd-fs at freebsd.org
> Sent: Sun, May 16, 2010 3:58:50 AM
> Subject: Re: Quick ZFS mirroring question for non-mirrored pool
> 
> Also, please reconsider going with Western Digital 
> RE4 2TB drives. These drives are all "GP" (Green Power) drives, which you do 
> not want. There have been numerous reports on the FreeBSD mailing lists 
> about problems with these drives (repeated head offloading/parking 
> causing problems in RAID arrays), and yes, it applies to Enterprise class 
> drive as well; WD has indirectly confirmed the problem in one user's case 
> by sending him a "fixed" firmware.  I can point you to threads if you 
> want to read them.


Well, there are two types of WD RE4 enterprise drives: "RE4" and "RE4 GP". Only "RE 4GP" is a "Green Power" drive. "RE4" is a performance drive spinning at 7200rpm (and I believe it is currently fastest enterprise 2TB drive on the market).