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10.5: How to create a RAM disk larger than 2.2GB
Authored by: maurizio.dececco on Aug 19, '10 02:52:10AM

Can the tests be repeated *without* a RAID configuration ?

The goal of a striped RAID configuration is to raise throughput by hiding the disk latency using parallelism;
essentially, while we wait for a disk to complete an operation, we start an operation on the second disk.

There is *no* latency on a RAM disk, of course, so, at least theoretically, there can be no advantage of a RAID configuration over a single RAM disk. All the visible differences are actually effects on the OS overhead of the configuration; the point to see is if the OS is able to cope with a RAM disk optimally (no need of async I/O, for example, data can be accessed immediately at CPU/Memory speed).

Maurizio



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