Page 1:The Future of High-Performance Enterprise Storage Belongs to Flash
Page 2:MemoRight Flash SSD MR25.2-064S
Page 3:Seagate Savvio 10K.2, 2.5” SAS at 10,000 RPM
Page 4:Seagate Cheetah 15K.5, 3.5” SAS at 15,000 RPM
Page 5:The RAID Setups: 8 Drives Each
Page 6:Test Setup
Page 7:Single Drive Benchmark Results
Page 8:Access Time And Interface Performance
Page 9:Read/Write Performance
Page 10:PCMark05 Application Performance
Page 11:I/O Performance
Page 12:RAID Benchmark Results
Page 13:Read/Write Transfer Performance
Page 14:RAID 0 I/O Performance
Page 15:RAID 10 I/O Performance
Page 16:RAID 5 I/O Performance
Page 17:RAID 6 I/O Performance
Seagate Cheetah 15K.5, 3.5” SAS at 15,000 RPM
The Cheetah has been Seagate’s high performance enterprise hard drive family for some time. These are 3.5” hard drives running at 15,000 RPM, and they are available at 300 GB, 146 GB and 73 GB capacity points. All drives come with 16 MB of cache memory.
One issue to consider is power consumption and drive temperature, which is much more of an issue here than with 7,200 RPM desktop hard drives. All 15,000 RPM drives require active cooling, and they are also noisy when compared to desktop models. Flash SSDs, however, require almost zero cooling, consume only a few watts as opposed to 5-15 W and make absolutely no noise.
The Cheetah 15K.5 delivered up to 128 MB/s maximum throughput, which makes it the fastest mechanical hard drive we’ve ever seen in our test labs. The minimum transfer performance of 61 MB/s also is an excellent result, although the average rate of 107 MB/s is more impressive. Clearly, this drive delivers up to 40% higher transfer rates than the Savvio 10K.2. We also found the 5.9 ms average access time to be best of class. Remember that 3.5” desktop hard drives at 7,200 RPM are at 12-15 ms, taking twice as long, on average, for access.
Beating the Flash SSDs in Sequential Writes
When looking at write throughput, the Cheetah 15K.5 delivers higher performance than the 104 MB/s we’ve seen with the MemoRight flash SSDs, unless you use the entire capacity and force the hard drives to use the inner areas of the rotating platters, which typically are the slowest. This result is reflected in the PCMark 05 File Write benchmark, which shows 20% better performance for the Cheetah 15K.5.
Let’s see what the Cheetah 15K.5 can do in a RAID 0 configuration with eight hard drives.
- The Future of High-Performance Enterprise Storage Belongs to Flash
- MemoRight Flash SSD MR25.2-064S
- Seagate Savvio 10K.2, 2.5” SAS at 10,000 RPM
- Seagate Cheetah 15K.5, 3.5” SAS at 15,000 RPM
- The RAID Setups: 8 Drives Each
- Test Setup
- Single Drive Benchmark Results
- Access Time And Interface Performance
- Read/Write Performance
- PCMark05 Application Performance
- I/O Performance
- RAID Benchmark Results
- Read/Write Transfer Performance
- RAID 0 I/O Performance
- RAID 10 I/O Performance
- RAID 5 I/O Performance
- RAID 6 I/O Performance