On 29 November 2010 20:39, GMAIL <piotr.jasiukaj...@gmail.com> wrote:
> Does anyone use Seagate ST32000542AS disks with ZFS? > > I wonder if the performance is not that ugly as with WD Green WD20EARS > disks. > I'm using these drives for one of the vdevs in my pool. The pool was created with ashift=12 (zpool binary from http://digitaldj.net/2010/11/03/zfs-zpool-v28-openindiana-b147-4k-drives-and-you/), which limits the minimum block size to 4KB, the same as the physical block size on these drives. I haven't noticed any performance issues. These obviously aren't 7200rpm drives, so you can't expect them to match those in random IOPS. I'm also using a set of Samsung HD204UI's in the pool. I would urge you to consider a 2^n + p number of disks. For raidz, p = 1, so an acceptable number of total drives is 3, 5 or 9. raidz2 has two parity drives, hence 4, 6 or 10. These vdev widths ensure that the data blocks are divided into nicer sizes. A 128KB block in a 9-wide raidz vdev will be split into 128/(9-1) = 16KB chunks. Cheers,
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