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Date: Fri, 04 May 2007 03:42:52 +0200
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To: "Wilkinson, Alex" <alex.wilkinson@dsto.defence.gov.au>
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Cc: freebsd-geom@freebsd.org
Subject: Re: graid5 compilation problem
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Wilkinson, Alex wrote:
>     0n Fri, May 04, 2007 at 01:50:48AM +0200, Fluffles wrote: 
>
>     >deniswork@uzvik.kiev.ua wrote:
>     >> Thanks, this help!
>
> Question: Is there a graid5 guide anywhere ?
>           I would like to test this code out.
>   

I'm working on one; but basically it's compile (works on both 6 and
7-CURR) and go using "graid5 label <volumename> <disks>". and you can
use it straight away. I've done extensive benchmarking but results
depend on:

- hardware, especially CPU/MEM/BUS technology
- disk bus bandwidth; avoid PCI whenever possible, PCI is depricated.
Use onboard connectors directly tied to chipset if possible
- the version of graid5, stable or TNG (take the graid5-eff.tbz package
instead of graid5.tbz); TNG has nice speed improvements
- disk speeds themselves


Under the right conditions (dualcore with 8 SATA disks on embedded bus)
it is possible to achieve 400MB/s *write* throughput, which is short of
amazing considering this is 100% software RAID, and leaves many
XOR-hardware RAID solutions behind. ;-)

- Veronica