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The bottom line on queuing is that it’s covered; all enterprise drives have queuing. 5 Drive Performance Summary When you characterize the performance of the drives within your system, it can be boiled down to random I/O performance (I/O per sec or seek) and sequential performance (MB/s). Drive specs you should pay attention to include: Drive random I/O performance (as measured by Iometer with a random workload) Drive seek performance (ms) Drive sequential performance (MB/s, higher is better) There is a description on the use of Iometer in Appendix E.

1. 5 Performance/Power IOPS/watt 300 IOPS, 12 watts IOPS/watt = 25 Capacity/Cost GB/$ 300G, $200 GB/$ = 2 Capacity/Power GB/watt 300G, 12 watts GB/watt = 33 Notice the benefit (performance or capacity) is always in the top of the fraction (numerator), and the expense (cost or power) is always in the bottom of the fraction (denominator). This way, bigger is always better. 2 serves to simplify the total storage view. com for approximate Web server performance. IOPS/$; but not better in IOPS/watt than 15K rpm drives.

Let’s cover the same variables of seek and spin for sequential workloads: Sequential performance is how fast the bits come off the platter Sequential performance is highly dependent on bit density. Sequential performance is not heavily dependent on spin speed. fm Page 22 Thursday, December 16, 2010 9:29 AM 22 Data Center Storage: Cost-Effective Strategies, Implementation, and Management Sequential performance is not heavily dependent on disk interface (FC, SAS, or SATA). ” is that drive performance is limited by how fast bits can be read or written off the platter (roughly 200 MB/s).

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