[mythtv-users] Software RAID

MacNean Tyrrell dardack at gmail.com
Fri Mar 9 19:31:26 UTC 2007


On 3/9/07, Dan Ritter <dsr-myth at tao.merseine.nu> wrote:
>
> On Fri, Mar 09, 2007 at 12:29:07PM -0500, MacNean Tyrrell wrote:
> > <snip>
> > I did mean to ask, do all my drives have to be the same size?  for Raid
> 5
> > (seems to be concensus best one for space saving with Raid that i can
> find
> > on net).  Or if not do i need even numbers, ie 2x250gig, 2x300gig, etc.
> or
> > can i have 1x320, 2x200, 1x250, etc?
>
> No, but all of the mirroring or striping schemes will limit you
> to the smallest common partition size.
>
> Suppose you want RAID 5 over four drives: 100, 200, 200, 250.
> You can do a 100 x 4 partition RAID 5 that gives about 300 of
> usable space. You can use LVM to create a single filesystem that
> has no redundancy, but covers 100 + 200 + 200 + 250 = 850
> usable. You could do 200 x 3 RAID 5 to get 400 usable, and still
> have a whole unused 100 drive, and 50 free in a partition on the
> 250 drive.
> <snip>


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?
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