On Sun, Apr 25, 2010 at 10:02 PM, Dave Pooser <dave....@alfordmedia.com> wrote: > Assuming I'm going to be using three 8-drive RAIDz2 configurations, and > further assuming this server will be used for backing up home directories > (lots of small writes/reads), how much benefit will I see from the SAS > interface?
SAS drives are generally intended to be used in a multi-drive / RAID environment, and are delivered with TLER / CCTL / ERC enabled to prevent them from falling out of arrays when they hit a read error. SAS drives will generally have a longer warranty than desktop drives. The SMART command set in ATA-7 and the ATA-8 spec should eliminate the distinction, but until it's fully supported by manufacturers desktop drives may not degrade as gracefully in an array when hitting an error. From what I've read, both WD and Seagate desktop drives ignore the ERC command. Samsung drives are reported to work, and I'm not sure about Hitachi. So far as backplanes are concerned - You can connect the backplane with SAS and still use SATA drives. -B -- Brandon High : bh...@freaks.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
