Mylex DAC960PJ Manual de usuario descargar pdf (Pagina 6)

P/N: MKT102-011 DAC960PJ vs. AMI 434 6

Controller Configuration

One approach to benchmarking two RAID controllers is to keep all the default settings

and just run the benchmark program. Another approach is to compare the best-optimized

case for both controllers and compare them using settings that might be used in actual

tuned systems. Though definitely more time-consuming and more complex, the

optimized settings were used in this comparison.

On the AMI 434, several settings were changed to get the best numbers. The default

values of 8KB stripe block size, read-ahead cache policy, and write-through caching were

changed to 16KB stripe block size, normal read cache policy, and write-back caching.

The changes resulted in significant improvements over the default settings for the AMI

434.

On the Mylex DAC960PJ, the write-through cache policy was changed to write-back. In

general, RAID vendors disable the write-back cache by default. Write-back cache

normally provides the best performance but requires an optional battery backup unit to

protect against possible loss of write-buffered data, in case of power failure.

As an additional note, Mylex cache size was kept at the default 8MB, whereas AMI is

tested with 16MB.

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Mylex DAC960PJ Manual de usuario Pagina 6