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From: Peter Kieser <peter@kieser.ca>
To: Andrew Dunn <andrew.g.dunn@gmail.com>
Cc: Mdadm <linux-raid@vger.kernel.org>
Subject: Re: Use of WD20EARS with MDADM
Date: Fri, 26 Mar 2010 13:27:17 -0700	[thread overview]
Message-ID: <4BAD18A5.1080905@kieser.ca> (raw)
In-Reply-To: <4BAB8D41.4010801@gmail.com>

On 3/25/2010 9:20 AM, Andrew Dunn wrote:
> Recently Dell is selling their WD20EARS (2TB) for 90$
>
> This being one of the best PPG (Price Per Gigabyte) snatches I have
> seen, I was considering buying 8 of them for an mdadm array.
>
> Has anyone had experience with these drives?
>
> Note, they have 4K sectors.
>
> Thank you for your kind responses.
>
>    
Hello,

The 4096-byte sector drives work fine with mdadm. The main problem you 
are going to run into with the WDC Green drives is their 8 second "idle" 
setting. After 8 seconds, by default, the drive parks its heads. This 
can lead to an amazingly high Load Cycle Count (LLC) after just a month 
of operation due to the fact that most disk access happens around that 
time causing the drive to park and unpark in repeated cycles.

To fix this, find a utility called wdidle3 (I have it, if you are unable 
to locate it) and set the idle timeout on the drives to 300 seconds. 
These drives do not support TLER, there is no ability to set it via 
firmware anymore - WDC removed this ability sometime last year.

-Peter

  parent reply	other threads:[~2010-03-26 20:27 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-25 16:20 Use of WD20EARS with MDADM Andrew Dunn
2010-03-25 17:01 ` Asdo
2010-03-25 17:58   ` Mark Knecht
2010-03-25 20:23     ` John Robinson
2010-03-26 10:45     ` Asdo
2010-03-25 17:10 ` David Lethe
2010-03-25 17:45   ` Asdo
2010-03-28 16:19     ` Stefan *St0fF* Huebner
2010-03-29 16:59       ` WD20EARS data Stefan /*St0fF*/ Hübner
2010-03-29 17:13         ` Stefan /*St0fF*/ Hübner
2010-04-14 19:53       ` Use of WD20EARS with MDADM Bill Davidsen
2010-04-19 14:17         ` Phillip Susi
2010-04-21 13:20           ` Bill Davidsen
2010-04-21 13:45             ` Tim Small
2010-04-21 14:32             ` Mikael Abrahamsson
2010-04-21 21:58               ` Berkey B Walker
2010-05-02 22:33                 ` Bill Davidsen
2010-05-03  0:08                   ` Berkey B Walker
2010-04-21 15:14             ` Phillip Susi
2010-04-21 16:42               ` Bill Davidsen
2010-04-21 17:36               ` Mark Knecht
2010-04-21 18:40                 ` Tim Small
2010-04-21 19:01                   ` Mark Knecht
2010-04-21 19:31                     ` Clinton Lee Taylor
2010-04-22  0:51                       ` Steven Haigh
2010-04-21 19:33                     ` Phillip Susi
2010-04-21 20:36                       ` Mark Knecht
2010-05-12 13:06                       ` Tim Small
2010-04-22 11:40                     ` wdidle3 Tim Small
2010-04-22 16:13                   ` Use of WD20EARS with MDADM Khelben Blackstaff
2010-04-22 18:16                     ` Simon Matthews
2010-04-22 19:44                     ` Phillip Susi
2010-04-22 23:23                       ` Mark Knecht
2010-04-23  0:03                         ` Richard Scobie
2010-04-23  1:29                           ` Mark Knecht
2010-04-23  3:49                           ` Phillip Susi
2010-04-23  3:44                         ` Phillip Susi
2010-04-21 15:52             ` Simon Matthews
2010-04-21 19:24             ` Richard Scobie
2010-03-26 20:27 ` Peter Kieser [this message]
2010-03-26 20:59   ` Mark Knecht
2010-03-26 21:01     ` Peter Kieser
2010-03-26 21:06       ` Mark Knecht
2010-03-26 21:16         ` Mark Knecht
2010-03-26 21:19           ` Richard Scobie
2010-03-26 22:38             ` Mark Knecht
2010-03-26 22:47               ` Peter Kieser
2010-03-26 22:50               ` Matt Garman
2010-03-26 22:51                 ` Peter Kieser
2010-03-26 23:01               ` David Rees
2010-03-27 23:31                 ` Mark Knecht
2010-03-26 21:45   ` Matt Garman

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