Re: [Qemu-devel] [Bug 1261320] [NEW] Virtual Disk with over 16TB

[Stefan Hajnoczi]

On Mon, Dec 16, 2013 at 09:37:34AM -0000, Chris Weltzien wrote:
> is there a option to create a disk for a vm with a size over 16TB.
> 
> the problem that after the diskfile reach 16TB, the disk get a state of 
> read-only at this limit.
> I know, that 16TB file size is max, is there a option to create the disk in 
> mutliple files?
> we want to use 22 TB. in the VM 

Basically no, not in a clean way for a production VM.  Can you attach
multiple disks to the guest and then use software RAID0 or LVM to get a
22 TB device inside the guest?

If not, here are some options:
1. Switch to a different file system (XFS is your best bet)
2. Use LVM (and get a slight performance boost for free!)
3. Tweak file system settings (e.g. bigger block size may allow larger
files)

Stefan