Sean Cook wrote:
> Redhat In their manual:
"With today's fast CPUs, Software RAID performance can excel against
Hardware RAID."
As I stated before, it depends on where your bottleneck is... if you
are not cpu bound, software raid is great! and will boost IO through
put on comparable hardware. If you are already CPU bound, forget
software raid, it will degrade your system to a crawl...
Badly done tests circa 1998 without any sort of methodology, mention of
cluster sizes, etc is proof than any idiot can make a computer slower.
I'll argue that a fully supported hard raid card is always superior to
a software raid by it's very nature, having local I/O cache and a
dedicated chip. However there are definitely workloads where a software
raid is good enough that spending money on a hardware raid card is
pointless. I can not imagine a case where all things being equal that
software raid would be measurably faster.
In the event that removing your RAID card makes your disk 5x faster I'd
also recommend removing the admin who setup the original system as well. :-)
kashani
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