[DRBD-user] Drbd device limit, 8TB available from 16TB partition

[Hari Sekhon]

Hi,

   I have a server with just around 17TB usable storage which I want to 
replicate at the block level via drbd.

I got the complaint regarding the 16TB max partition size supported, so 
reduced the 17TB partition to 16TB and successfully set up the drbd 
metadata on it.

However, now I can only see 8TB of it.
I understand the limit is 8TB having looking through previous mails to 
the this list, but then why did it let me use up a 16TB partition and 
waste half of it?

This is running on a x86_64 CentOS 5 server with drbd 0.8.13 (I had been 
using drbd 2.8 but this kept crashing the system with a kernel panic 
when trying to write to the mounted drbd0 partition with xfs on it. 
Downgrading to 8.0.13 and then re-creating the metadata, mounting and 
retrying solved the problem)

Is there any way of getting the thing to do all 16TB of the partition?

Otherwise I'll have to destroy it and rework it with 2x8TB which would 
be a pain. I'd then be tempted to do an lvm on the top of those 2 drbds 
even though I know Lars recommends against it, because I really could do 
with the 16TB contiguous space replicated...

-h

-- 
Hari Sekhon
Always open to interesting opportunities
http://www.linkedin.com/in/harisekhon