2 posts • joined 6 Jun 2011
Architecture Matters More than Media Type
One of our primary intentions in going through the SPC process was to test the SPEAR architecture’s scale-out capabilities. The SPC-1 put the K2 through a heavy workload over a 24-hour period. It came through with flying colors showing that Kaminario allows you to achieve high-end performance without suffering from bottlenecks of any type.
Some comments have focused on the fact that the K2 configuration included DRAM. So of course, the IOPS were going to be super fast. From our vantage point, the media type matters less than the architecture. We happened to certify the K2-D in this test result, but SPEAR will also enable high-level, scalable storage performance for Flash. That is the beauty of having a powerful and flexible architecture. It provides you with more choices and the ability to adapt as newer memory types emerge -- All in an environment with advanced data protection.
This is an excellent comparison of the pros and cons of different types of SSD deployment. One point I’d like to make sure the reader understands is that many of the limitations of SSD described here are simply irrelevant when it comes to DRAM. DRAM has none of the life limitations of SSD and has far superior write performance. DRAM performance does not degrade over time as Flash performance does and DRAM does not die after a specified number of writes. Like the Energizer bunny, DRAM just keeps working the same way it did on day one. Those are important things to consider when choosing between a flash and DRAM SSD solution. As you mention, it’s also important to understand the superior performance characteristics of purpose built appliances, which are not constrained by the I/O limitations of disk-like architecture.
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