[OpenIndiana-discuss] Are there any issues re ZFS on 2TB disks (from WD??) with large blocksizes?
matt.connolly.au at gmail.com
Wed Feb 9 11:06:17 UTC 2011
Here's my experience:
On 07/02/2011, at 11:31 PM, Piotr Jasiukajtis wrote:
> On Feb 7, 2011, at 1:13 PM, Robin Axelsson wrote:
>> Could someone enlighten me as to what is wrong with WD's disks, and particularly what's wrong with their EARS disks?
> 1. They emulate 512b with a big write performance hit.
> Workaround is to use patched zpool or use zfs sync=disabled, however you will not use patched zpool on a boot zpool.
I have a simple setup with 2x SATA drives: 1 x Samsung Silencer HD154UI and 1 x Western Digital Green WD15EARS.
The write performance of the WD is so bad that the entire system becomes totally unresponsive, sometimes for minutes at a time, while the drive catches up with a massive backlog of writes. (Read performance is fine.) Symptoms are exactly the same as the first post in this thread:
I stil get these symptoms with OI-148.
> 2. They spin down heads every 8 seconds.
This particular problem can be overcome by using the WD3IDLE command to defeat this behaviour.
> 3. I have seen a few bad sector reports and bad heads on those drives.
I haven't seen any read/write errors in `zpool status` ever. (nearly one year old).
I'm not going to get another WD * EARS drive.
More information about the OpenIndiana-discuss