[mythtv-users] Software RAID

Dan Ritter dsr-myth at tao.merseine.nu
Fri Mar 9 17:53:30 UTC 2007


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.

For my situation, it makes sense to just partition the drives
normally and let Storage Groups figure it out. If your data is
more valuable (say, because you are ripping all your DVDs or CDs
and storing them here) you might want an approach that gives
some redundancy. Or a backup solution.

-dsr-



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