[mythtv-users] Software RAID
matthew.garman at gmail.com
matthew.garman at gmail.com
Fri Mar 9 17:38:09 UTC 2007
On Fri, Mar 09, 2007 at 12:29:07PM -0500, MacNean Tyrrell wrote:
> 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?
For RAID 5, you *can* have drives of differing size, BUT, it won't
make optimal use of your space. RAID 5 will essentially treat each
drive as though it were the size of your smallest drive.
For example, if you have 1x320 + 2x200 + 1x250, then your total
capacity would be:
- 4 total drives
- minus one for parity
- smallest drive is 200
- total capacity: (4-1) * 200 = 600
Formula is (n-1)*c, where c=size of your smallest drive.
Of course, you can play games with partitioning and/or lvm to make
the most efficient use of your available storage. But that kind of
defeats the whole purpose of RAID5.
-Matt
More information about the mythtv-users
mailing list