On Feb 9, 2011, at 12:06 PM, Matt Connolly wrote: > 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: > > http://community.wdc.com/t5/Desktop/Poor-performace-in-OpenSolaris-with-4K-sector-drive-WD10EARS-in/td-p/20947 > > I stil get these symptoms with OI-148. Try zfs sync=disable - that works on 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. Actually it's not possible anymore with 2TB drives with the latest firmware revision. >> 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). My first EARS drive comes with broken heads, second one is good so far. However my colleges also has some issues with those drives, after a few months of uptime they just broke (bad sectors and/or heads). > I'm not going to get another WD * EARS drive. Same here. I have never seen so bad drive design. -- Piotr Jasiukajtis | estibi | SCA OS0072 http://estseg.blogspot.com _______________________________________________ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
