[Gllug] Large raid 5/5+0 setup

[Andy Millar]

> > I've started searching the net to get a better understanding about raid
> > 5/5+0 and the hit I can expect on performance.

> > The purpose of my searching is to sort out my myth-tv needs. I am
> > currently thinking that I would like to have 20 x 1TB SATA drives in a
> > raid 5+0 configuration for my backend server

I have the joy of playing with a reasonable specified homebrew style
storage server which doesn't seem too far off what you're after.

I run a:

- Intel Core(TM) i& 920 @2.67GHz
- 16GB RAM
- 3ware 9650SE-16ML 16 port SATA/SAS Raid Card with BBWC
- 16x Seagate 1.5TB Drives

Configured in RAID6 with a hot spare, I get 17.69 TB usable space.

The rebuild time during light use for a single drive is approx. 6-8
hours.

I've managed to get around 600MB/s read and 400MB/s write locally on
this device when using large block sizes.

I also seem to remember it costing around £4000-4500, which really isn't
a bad price for the space -- even if you compare it to the low end
"enterprise" storage arrays.

Andy
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