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The Advantages Of SAS over Sata hard drives

The Advantages Of SAS over Sata hard drives


    

The Advantages Of SAS over Sata hard drives

by John B. Emmerson III

SAS stands for Serial Attached SCSI. Basically, a SAS drive utilizes the same form factor as a SATA drive but has several high performance advantages. At first, there's the platter speed. While normal SATA drives function at 7200RPM, a SAS drive runs at 10K or 15K. Although the platter speed is double than the SATA drives, the MTBF (Mean Time Before Failure) remains at the industry standard of 1.2 million hours.

SAS drives are typically utilized in server and high-end workstation systems where speed and I/O frequency reign highest. Now, that being said, there are so many factors in building a screaming fast, but rock-solid, workstation or server.

While speed is concerned, you have to to be looking at the right drives first and foremost. Nowadays, I tend to spec in a couple of SSD's (Solid State Drive) in a RAID 0 (Redundant Array of Inexpensive Disks) for the boot and applications drive, then for scratch disks/added storage, I like to do 3-5 or more SAS drives in a RAID 5 (best blend of redundancy and speed, with the addition of parity).

That being said, there are better considerations, such as the RAID stripe size (or stripe width). The stripe size defines what size blocks of data will be given to each drive in the array. It's vital (where speed is concerned) that the engineer do his job in deciding what the server will be used for. If the application the server is designed for houses small files, or is a file server for smaller files, you want to prefer a small stripe size, say 256KB or so. Now, for people doing database work, photo/video/audio editing, rendering or production, they require as big a stripe as the controller permits for.

So, where stability is concerned, the drives must be properly paired (this is like 90% of the builders in the world are obvious to which, in turn, can make the job very hard as it tends to give the entire white-box market a black eye). If drives in a RAID array are not correctly matched by Firmware version, the probability are that at least one of the drives will fail within the first year. Based on the class of array chosen, this could cleanly mean the company has to foot the bill for bigger hardware costs, or be as horrific as catastrophic data loss.

About the Author:
High performance system requires toSAS hard drives. You should consider to buy SAS hard drives. So,Sata hard drives are good but SAS is more good.


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