Great article here on the Aussie Storage Blog on why NL-SAS > SATA.

Aussie Storage Blog

Here are two common statement I often hear from clients:

  1. I don’t just want SAS drives, I also want SATA drives.  SATA drives are cheaper than SAS drives.
  2. Nearline SAS drives are just SATA drives with some sort of converter on them.

So is this right?  Is this the actual situation?

First up, if your storage uses a SAS based controller with a SAS backplane, then normally you can plug SAS drives into that enclosure, or you can plug SATA drives into that enclosure.    This is great because when you plug SATA drives into a SAS backplane, you can actually send SCSI commands to the drive plus you can send native SATA commands t00 (which is  handy when you are writing software for RAID array drivers).

But (and this is a big but) what we do know is that equivalent (size and RPM) SAS drives perform better than SATA drives…

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