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Our last profile covering simulated Web Server activity is completely read-only. In this setting the 7,200RPM hard drives were able to keep up better than they had in previous tests with write activity mixed in. At our highest thread and queue count, we measured a peak I/O rate of 5,786 IOPS with our 15K SAS array, 4,068 IOPS with our 10K SAS array, and 2,081 IOPS with the 7.2K SATA array.
The 10K and 15K SAS arrays inside out iXsystems Titan iX-316J were able to keep average latency in check at effective queue depths below 64, with the 7.2K array having a lower limit of 32 before average latency increased significantly.
Max latency in our Web Server test had similar with battery like Lenovo 40Y7666 Ac Adapter, Lenovo 40Y7710 Ac Adapter, Lenovo 92P1105 Ac Adapter, Lenovo 92P1109 Ac Adapter, Lenovo 92P1212 Ac Adapter, Lenovo FRU 92P1108 Ac Adapter, Lenovo FRU 92P1114 Ac Adapter, Lenovo 3000 N100 Ac Adapter, Lenovo ThinkPad Z60 Ac Adapter, Lenovo ThinkPad X60 Ac Adapter, Lenovo ThinkPad Model 44x Ac Adapter, Lenovo PA-1900-171 Ac Adapter results as the average latency section, where peak response times were kept to a minimum at effective queue depths below 64 or 32 (for the 10/15K SAS arrays and 7.2K SATA array respectively).
With no write activity, the 15K SAS array had the best latency standard deviation across the entire range of thread and queue levels, followed by the 10K then 7.2K arrays. The same held true with the sweet spot, having best consistency below EQD64 for the faster spindles and EQD32 for the 7.2K array.
There are many times when a headless JBOD makes perfect sense for growing storage needs. The iXsystems Titan iX-316J provides an easy to configure 3U chassis that with 4TB hard drives can support a total capacity of 64TB. Of course as we have shown, it adapts easily to 2.5" drives, though you do give up the density benefits in this case compared to iXsystems 2U 24-bay SFF options. When it comes to compatibility, the Titan iX-316J can connect to both HBAs and RAID cards through an industry-standard SFF-8088 connection. The only downside, which would apply only if you installed SSDs in this array, is a single 4-channel SAS connection is limited to 2,400MB/s over SAS 6.0Gb/s. That limit won't hold back platter drives, but flash drives which peak at 500MB/s+ each would require more miniSAS connections to utilize their full potential.
The 10K and 15K hard drive arrays offered the greatest throughput and lowest latency in our random-activity mixed workloads. In sequential workloads the 7.2K RAID10 array offered the greatest 8K read speed and 128K write speed. For enterprise buyers deciding the best hard drive for a particular application, they need to weigh capacity requirements versus performance needs and then factor in cost. The 7.2K drives offer the best capacity per dollar, but can't match the I/O performance of the faster 10K and 15K drives. For certain needs such as backups or bulk storage random access isn't as important, making the 7.2K hard drives more appealing. In either situation though the iXsystems Titan iX-316J worked quite well no matter the drive size or interface.