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Re: AW: RAID greater than 2TB on Fedora Core 3



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 cfl rr com

Q:	What's buried in Grant's tomb?
A:	A corpse. 


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