Jaye Mathisen wrote:
> I was just curious what people's thoughts were on the potential "total
> system throughput" (whatever you choose it to be), wrt using software
> It would seem that software RAID would just kill big chunks of cache,
> especially CPU cache, moving lots of data throught it to calcuate CRC's.
> perhaps the raid 1/0's would be fine, since the calcuation could be
Greg can probably give a better answer than I can, but one thing to be
aware of is that host-based RAID, like Vinum, usually has access to a
lot more processor and memory resources than hardware RAID controllers.
My experience is limited to running an I/O bound, not compute-bound,
server using both Vinum and a Mylex DAC1100 with 64MB RAM, using RAID-1.
The system was a DELL 2400 with 2x 600 Mhz Pentium III. The application
was a non-interactive web filter running over millions of web pages
grabbed by a spider. The total throughput was significantly higher on
the software RAID system. The application inherently sloshes through
the caches anyhow, so little cache affect is achieved.
"Where am I, and what am I doing in this handbasket?"
Wes Peters Softweyr LLC
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