EMC has a Rule of Thumb for calculating performance:  15K SAS disk - for small block (less than 32KB) random IO (mix of reads and writes) = 180 IOPS.  So if you take five 15K SAS disks and create a Raid 5 raid group (4+1) - that mean that each disk can handle about 180 IOPS times the 5 disks = 900 IOPS for the raid group. This will provide good performance - less than 20ms for a LUN in that raid group.  This is a rough guideline - response time will increase as the IOPS increase.  If you increase the IO Size, then the IOPS will decrease (inverse relation).  In the "EMC CLARiiON Performance and Availability Release 30 Firmware Update Applied Best Practices.pdf" see page 96 - Random I/O section - this lists the drive type and IOPS.  glen
Hello, How can I calculate current CIFS performance hosted on RAID 6? I need to know throughput and latency.  Using 6 + 2 disks.  Each disk is 2 TB  Thanks
Calculate CIFS Performance