4k Random Read/Write
Each level tested includes 300 data points (five minutes of one second reports) to illustrate performance variability. The line for each queue depth represents the average speed reported during the five-minute interval. 4k random speed measurements are an important metric when comparing drive performance as the hardest type of file access for any storage solution to master is small-file random. One of the most sought-after performance specifications, 4k random performance is a heavily marketed figure.
The Seagate Enterprise Capacity 3.5 HDD v4 averages 262 IOPS at QD256, the HGST Ultrastar He6 averages 234 IOPS at QD256, and the 7K4000 delivers an outstanding 275 IOPS. The Seagate v4 falls in this read-only test to the 7K4000 and its SAS connection, but it soundly bests the He6.
The 7K4000 delivers the lowest latency, and the Seagate v4 delivers a tighter performance profile than the HGST He6 at QD256.
The write workload shines a different light on the Seagate v4, which runs away with the lead by delivering an average of 289 IOPS at QD256. The He6 averages 234 IOPS, and the 7K4000 averages 262 IOPS.
All three drives deliver optimum performance-to-latency ratios at lower queue depths.
Our write percentage testing illustrates the varying performance of each solution with mixed workloads. The 100% column to the right is a pure write workload of the 4k file size, and 0% represents a pure 4k read workload.
The HGST 7K4000 leans on its impressive read speed to begin the test with a slight lead, but the Seagate v4 leads in seven of the 11 write mixtures.
We record power consumption measurements during our test run at QD256. The Seagate v4 averages 9.53 watts, the He6 averages 7.03 watts, and the 7K4000 averages 8.55 watts during the measurement window.
We generate IOPS-to-Watts measurements from data recorded during the test period. The spread for 4k random write activity is within four IOPS-per-Watt from highest to lowest, which is essentially a wash. For the 4k random read workload, the Seagate v4 averages 24 IOPS-per-Watt, the He6 provides 29 IOPS-per-Watt, and the 7K4000 measures 30 IOPS-per-Watt.
The Seagate v4 delivers a surprising level of efficiency in the write workload, and it only falls behind by 6 IOPS for the read workload. Higher performance helps offset the increased power consumption of the v4. The primary power advantage of the He6 is in Watts-per-TB measurements and idle power consumption.
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- Page 1 [Introduction]
- Page 2 [Seagate Enterprise Capacity v4 Internals and Specifications]
- Page 3 [Test System and Methodology]
- Page 4 [Benchmarks - 4k Random Read/Write]
- Page 5 [Benchmarks - 8k Random Read/Write]
- Page 6 [Benchmarks - 128k Sequential Read/Write]
- Page 7 [Benchmarks - Database/OLTP and File Server]
- Page 8 [Benchmarks - Email Server]
- Page 9 [Final Thoughts]
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