[mythtv-users] Software RAID (was: Where are those new 1TB drives?)
mythtv at macker.co.uk
Fri Mar 9 11:35:22 UTC 2007
John Drescher wrote:
>> Very cool. Have you tried RAID 5 with FreeNAS? Does it require a
>> powerful processor? And how DO you power all those drives?
> I do not use FreeNAS. I am running all my raid servers (mostly
> software raid6 using madam) on 64 bit gentoo. And for the machine with
> 17 drives ( dual processor opteron 246 + 4 GB memory ) I have 2 400W
> supplies with all the hard drives on one power supply and everything
> else on the other. I did actually add a dummy load on the power supply
> that is connected to the hard drives because it required a minimum
> load on the 3.3V rail which was not being met. Right now I would just
> get a 600 or 700W supply and use that instead.
I do something similar for my home fileserver(560W power supply for the
14 RAID drives, another 560W for the motherboard and OS drives). The
second supply is overkill, but it was a spare.
The biggest thing to remember is that you need a supply with a strong
single 12V rail for the drives. Most Tagan's allow you to toggle between
split and single rail and PC&P also make large single rail PSU's.
I've always sized my supplies based on the total *max* draw of all the
drives combined. This is not the figure on the drives themselves, you
usually have to dig around the spec sheets for this figure.
More information about the mythtv-users