SAS 6Gb raid VS. SATA III 6Gb raid
Other than SAS being the only one to use SAS drives, what is the difference between these two types of raid? If they are both 6Gb/sec, which would be better for SSD's? I am wanting to set up a raid in my Dell Precision T7400 in a PCI express 16X 2.0 slot. I am going to be using eight Samsung 512Gb 840 pro's in two raid 10 configurations of four each. One for each operating systems I plan to run. I have been looking at an LSI MegaRAID SAS 9266-8i for about $550.00 and several SATA III raid controller cards that are much less expensive. Any and all help is greatly appreciated.
The LSI MegaRAID SAS 9266-8i is a great controller and you will also need two mini-SAS SFF-8087 to SATA x4 connectors (it also has x4 SAS connectors available). I would use that or an Adaptec 7805 if you really want performance and it sounds like you do. Both of these cards are excellent and can be used with either SAS or SATA drives, just depending on the fanout cables used. I would not skimp on the controller for those drives.
RAID levels for SATA or SAS are no different, it is just the drive connector and SAS characteristics that differs. SAS hard drives are usually the highest quality (usually have a 10x great reliability spec for error), now are mostly 15k rpm so are faster, and have additional data-integrity built in. Being primarily enterprise, they cost substantially more. SAS SSDs are terribly expensive and well beyond most home/home office user needs.
Right, but the point is that it doesn't matter which drive type you use (SAS or SATA) -- both are very similar in performance and price once you add the cables to the LSI and compare it to the Adaptec kit (that comes with the two cables you need to add 8 SATA drives like THIS). The Adaptec is PCIe 3.0 compliant, while the LSI is only 2.0.
My comparison between SAS and SATA drives is written in this post http://www.tomshardware.co.uk/forum/1824399/last-read