AW: RAID greater than 2TB on Fedora Core 3
Scot L. Harris
webid at cfl.rr.com
Mon Apr 4 19:59:45 UTC 2005
On Mon, 2005-04-04 at 15:09, Masopust Christian wrote:
> hi scot,
>
> it's a RAID5 with 8 x 400GB disks, so i'd expected a size of
> appr. 2,8TB (Raid says it's about 2,6TB) but Fedora only see
> exactly 2TB....
That should give you 3200GB raw and in raid 5 there will be about 12.5%
(1/8 * 100) overhead or ~400GB. Which means you should get about
~2800GB of usable space. You will lose a little more when you format
the partition.
I did find this reference to a 2TB limit for block devices:
http://www.linuxjournal.com/article/6238
Read almost at the bottom of the page.
And this article that seems to indicate a patch for this is being worked
on.
http://www.uwsg.iu.edu/hypermail/linux/kernel/0205.1/0423.html
So it does appear that you may be hitting a kernel limitation on >2TB
file systems.
I recently did create a 1TB file system from four 300GB hard drives
using LVM. No raid on this as I am not that concerned about this
application.
Using XFS file system and it is working very well. Used over 600GB on
it so far.
--
Scot L. Harris
webid at cfl.rr.com
Q: What's buried in Grant's tomb?
A: A corpse.
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