WintelGuy.com
RAID Performance Calculator
RAID Type:
Drive capacity (GB):
Single drive performance:
  
Single drive cost:
Number of drives per RAID group: 
Number of RAID groups:
Read operations (%):
For SSD RAID use the special version of the calculator...

Total Performance = 226.67 IO/s
Total usable capacity = 0.50 TB

RAID Type: RAID 1 (Mirror)
Reads 50%, Writes 50%
Number of RAID groups = 1
Number of drives per RAID group = 2
Total number of drives = 2
Single RAID group performance = 226.67 IO/s
Single drive cost =
Cost per TB usable =
Total cost =
Compare two configurations...
Calculate capacity...

Notes:
Number of drives per RAID1 group = 2
IO penalty (read) = 1/1 (one RAID IO per each host IO)
IO penalty (write) = 2/1 (2 RAID IOs per each host IO)
Fault tolerance = 1 disk drives per RAID group

How to use:
To calculate RAID performance select RAID level and enter single disk drive performance information, number of disk drives in the RAID set, and percentage of read operations. Approximate IOPS and throughput values for different drive types are provided in the table at the bottom of this page. Supported RAID levels are RAID0, RAID1, RAID5, RAID6, RAID10 (1+0).

IOPS (IO/s) and throughput (MB/s) are two common performance measurements for storage devices, such as disk drives and RAID sets. Most often IOPS measurement is used for random small block (4-8 KB) read and/or write operations typical for OLTP applications. MB/s is used for large block (>= 64 KB) random or sequential operations, such as file transfer and streaming.

This calculator does not perform conversion between IO/s and MB/s, and vice versa. If you've switched the units, do not forget to enter applicable value in the Single drive performance field.

Approximate IOPS and throughput values for different disk drive types:

Drive
(Type / RPM)
IOPS
(4KB block, random)
IOPS
(64KB block, random)
MB/s
(64KB block, random)
IOPS
(512KB block, random)
MB/s
(512KB block, random)
MB/s
(large block, sequential)
FC / 15K 163 - 178 151 - 169 9.7 – 10.8 97 – 123 49.7 – 63.1 73.5 – 127.5
SAS / 15K 188 - 203 175 - 192 11.2 – 12.3 115 – 135 58.9 – 68.9 91.5 – 126.3
FC / 10K 142 - 151 130 – 143 8.3 – 9.2 80 – 104 40.9 – 53.1 58.1 – 107.2
SAS / 10K 142 - 151 130 – 143 8.3 – 9.2 80 – 104 40.9 – 53.1 58.1 – 107.2
SAS/SATA / 7200 73 - 79 69 - 76 4.4 – 4.9 47 – 63 24.3 – 32.1 43.4 – 97.8
SATA / 5400 57 55 3.5 44 22.6
SSD To evaluate SSD RAID performance use the special version of the calculator...

Where did these numbers come from? Check the Hard Disk Performance Basics page.