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What are the merits of SAS vs SATA drives?

I am running a linux centos dedicated server. Basic specs are a Intel Dual Core Xeon X3065with 2GB ram and 2 x 160GB Sata drivers in RAID1 configuration. The server is used for host a php/mysql application.

I am in the process of upgrading, which will have a Quad Core Intel Xeon processor and 8 GB ram. One of the options is to upgrade to 2 x 300 GB SAS drives instead of 2 x 250 GB SATA drives. My understanding is that spindle speed on the SAS drives is 15k.

Is there any noticable speed difference from using SAS drives, and is reliability on a par with SATA?

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marked as duplicate by Mark Henderson Jan 15 '12 at 21:35

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Yes there is, they run at much faster speeds, so your Random Access is a lot better, also they write/read considerably faster. Reliability is about the same if they are Enterprise grade SATA disks. (or thats what the manufacturers say).

I'd refer you for more info to this page.

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There is quite a bit of either old or mis-information on that page. He's comparing 7.2k SATA drives to 15k SAS drives. Of course those SAS drives are going to outperform SATA there. Compare drives of like RPM, and there will be very little difference. –  EEAA Jan 15 '12 at 22:09
    
Sorry ErikA :( will try to keep that in mind for next time ! –  Lucas Kauffman Jan 15 '12 at 22:12
    
No prob. :) <filler> –  EEAA Jan 15 '12 at 22:13

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