"If your application is doing nothing more than a bunch of re-reads, you'll have the same performance on our two-level cache as a single-level SSD cache," Flint said. "On the other hand, in scenarios where you're running databases ... where things like indexes or temp tables become extra hot for a period of time, we can ensure those indices and temp tables are in memory, and in doing so, we can drive performance out of the system that goes well above from what you'd get from just moving all your data to SSD."
To ensure it does not duplicate work already being performed in DRAM, the CAS software takes control of all data access. The hottest data is placed on DRAM, while less hot, but still I/O active data, is placed on SSD.
Intel's CAS software provides cooperative integration between the standard server DRAM cache and the Intel SSD cache, creating a multi-level cache that optimizes the use of system memory and automatically determines the best cache level for active data.
Lucas Mearian covers storage, disaster recovery and business continuity, financial services infrastructure and health care IT for Computerworld. Follow Lucas on Twitter at @lucasmearian or subscribe to Lucas's RSS feed. His email address is firstname.lastname@example.org.
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