[mythtv-users] Software RAID

[Dan Ritter]

On Fri, Mar 09, 2007 at 02:31:26PM -0500, MacNean Tyrrell wrote:
> So if i bought 4x500gb sata drives, than used my IDE 320gig, could the 320
> server as the redundancy one and i would still get close to 2TB for storage,
> or would i have to partition each drive by 250gig's, have 70 left on the 320
> and the 250gig on the IDE could be the redundancy one?

Erm. What? No, redundancy is striped across all available
partitions.

4x500 + 1 x 320, you could:
RAID 5: 5 x 320, effective 4x320 = 1280
RAID 5: 4 x 500, effective 3x500 = 1500
RAID 5: 5 x 250, effective 4x250 = 1000 +
        4 x 250, effective 3x250 =  750 = 1750 in two filesystems

LVM, no redundancy: 4x500 + 250 = 2250 and also a 70 filesystem
left over.

http://en.wikipedia.org/wiki/Standard_RAID_levels

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