Page 1:SSD Performance On Demand: RAID Scaling Analysis
Page 2:I/O Performance In Abundance
Page 3:SATA Bottleneck: 3 Gb/s Is Not Enough
Page 4:Five SSDs In RAID 0
Page 5:Test Setup
Page 6:Benchmark Results: I/O Performance
Page 7:Benchmark Results: Iometer Streaming
Page 8:Benchmark Results: 4 KB Random Reads/Writes
Page 9:Benchmark Results: PCMark Vantage
Page 10:Conclusion: Capacity And Performance Scale Together
Five SSDs In RAID 0
The five SSDs used in the test come from Samsung. They do not have any strong product name, carrying only “Samsung SLC SSD“ and the product tag MZ3S9100-XAB4. Each drive has a capacity of 100 GB, is based on SLC NAND flash, has a 3 Gb/s SATA interface, and support for TRIM and Native Command Queuing (NCQ). Samsung claims 260 MB/s read and 245 MB/s write rates.
With an idle energy consumption of 1.7 W, this SSD requires much more than consumer models. It reaches 3.7 W under load, which is still acceptable compared to enterprise-class hard drives spinning at 10 000 and 15 000 RPM. Conventional disks can reach up to four times that number. Operating temperature is rated at between -10°C and 60°C, which is fairly standard in the SSD space. Samsung also offers a 200 GB model, should you need more server storage capacity.
In order to demonstrate the scalability as clearly as possible, we first benchmarked one of these SSDs and then created a RAID 0 array of two drives. With each new benchmark run, we added an additional drive so that, in the end, we can compare five test configurations and their differences easily.
Of course, the fast (but unsafe) RAID 0 mode is only used in special cases, while RAID modes with built-in redundancy are typically preferred. For this test however, we deliberately chose RAID 0, since it represents a best case for the kind of scaling we can expect.
- SSD Performance On Demand: RAID Scaling Analysis
- I/O Performance In Abundance
- SATA Bottleneck: 3 Gb/s Is Not Enough
- Five SSDs In RAID 0
- Test Setup
- Benchmark Results: I/O Performance
- Benchmark Results: Iometer Streaming
- Benchmark Results: 4 KB Random Reads/Writes
- Benchmark Results: PCMark Vantage
- Conclusion: Capacity And Performance Scale Together