128k Sequential Read/Write
We write to every LBA to highlight performance degradation from the outer to inner tracks of the drive. The drives begin with much higher speed on the outer tracks, and lose speed as it works inward. The small platter sizes allow the drives to write the entire platter of the drive very quickly, and the varying capacity points in the test pool are clear, with the high-capacity Enterprise Performance 15K v4 taking the longest to complete a pass across the platter.
128k sequential speed reflects the maximum sequential throughput of the HDD, and is indicative of performance in OLAP, batch processing, streaming, content delivery applications, and backup scenarios. Today's HDDs are increasingly used for sequential workloads as SSDs encroach upon the application space.
The Enterprise Performance 15K v4 drive averages an impressive 252 MB/s during the sequential read workload at QD256. The Savvio 15K.3 averages 187 MB/s, and the Toshiba offers 198 MB/s.
The 15K v4 exhibits excellent latency characteristics with sequential read activity.
Sequential write performance is important in tasks such as caching, replication, HPC, and database logging. The Enterprise Performance 15K v4 averages 251 MB/s, the previous-gen Savvio 15K.3 averages 187 MB/s, and the Toshiba weighs in with 196 MB/s.
The only weakness of the 15K v4 is an odd latency distribution that occurs right at the beginning of a sustained heavy write workload. The drive levels off to normal performance once the workload is underway, and this may be due to some reordering of data during the initial burst of activity.
The mixed-workload sequential testing is one of our most demanding tests. Many drives will fare very well on the high-end, but fall short with mixed sequential activity. The Enterprise Performance 15K v4 delivers class-leading sequential performance across the board.
The 15K v4 averages 7.8 watts.
The Enterprise Performance 15K v4 averages 28 MB/s-per-watt for both read and write activity.
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- Page 1 [Introduction]
- Page 2 [Enterprise Performance 15K HDD 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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