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. 4K random performance is a heavily marketed figure, and is one of the most sought-after performance specifications.
The Enterprise Performance 15K v5 starts out with an impressive average of 510 IOPS at QD256, and the TurboBoost model reaches 539 IOPS.
Our Latency vs IOPS charts compare the amount of performance attained from each solution at specific latency measurements. Many applications have specific latency requirements. These charts present relevant metrics in an easy-to-read manner for readers who are familiar with their application requirements. The HDDs that are lowest and furthest to the right exhibit the most desirable latency characteristics.
The Seagate 15K v5 TurboBoost model takes the lead in this test.
The Enterprise Performance 15K v5 averages 498 IOPS at QD256, and the TurboBoost model increases that up to 520 IOPS. We are accessing the full LBA range, so this increase in performance isn't primarily stemming from flash acceleration. The gain comes from the ability of the DRAM to coalesce random data in write-back mode. This is usually somewhat risky, but with the backing of the eMLC layer, to handle any power-loss events, the drive can operate in write-back mode safely.
The Enterprise Performance TurboBoost 15K delivers a tangible latency reduction.
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 TurboBoost model takes the lead for every write mixture during the measurement window.
We record power consumption measurements during our test run at QD256. It is important to consider watts-per-GB in the overall analysis due to the varying capacities in the test pool.
The Enterprise Performance 15K v5 draws 7.4 watts during the test, and the TurboBoost model draws 7.5 watts.
Both 15K models provide nearly identical performance.
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