1 TB SAS 7.2 K vs 1 TB SATA 7.2 K (DELL MD3000i)

Hi guys,.

I'm new to the SAN thing and hope someone can enlighten us.

I'm playing between the use of drives of 1 TB SAS or SATA 1 TB for my new DELL MD3000i SAN. Both drives work on 7.2 K rpm. It will be connected to the ESX and run "normal" virtual machines such as files and print Windows, Exchange, SQL, Linux, etc. Nothing very heavy.

A. you have any input on how the performance, reliability, etc. would be like between these two types of drives - SAS 7.2 K vs 7.2 K SATA?

(B) with 14 x 1 TB 7.2 K drives, should I run RAID5 or RAID10 to maximize performance? IIRC, 14 disks in a RAID5 configuration will have a rate of 14 pins, while 14 disks in RAID10 will throughout the 7 pins. Capacity is not a problem right now.

(C) on a note related, how about 14 x 450 GB SAS 15 K disks? Their execution in RAID10 is a complete overkill? Or RAID5 would be the sweet spot since the disks are already 15 K RPM?

Thank you very much!

My understanding is that the SAS drive interfaced will be 10-15% faster for the random i/o, even if speed control 7.2 k is the same. It is the ability of the difference between the fairly simple, integrated SATA on the drive controller and the SAS controller with double vent more advanced. So, all things being equal elsewhere the SAS interfaced by car will be a better choice for general use. For purposes of archiving, for example, there would be little difference. Pointing to the MTBF numbers are similar, readers are probably the same as their controller.

What levels of raid are in my opinion is one of the determinants for raid 10 is the problems that can occur with a raid 5 is the rebuild time and performance hit.

If you have several virtual machines running in production and you have a raid 5 rebuild during a working day, is it acceptable to have a lot of your virtual machine runs very slowly.

If it is not then use raid 10 and get the best performance as well.

Tags: VMware

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