On Mon, Jun 3, 2013 at 5:39 PM, Dusty Mabe <dustym...@gmail.com> wrote: > > It is possible that I was mistaken. Now when I switch back to > cache=none I am still able to execute trim operations. I'll > investigate a little more into my exact steps that I took and see if I > can come up with a reproducer for the issue I observed. >
Paolo, I was mistaken. I had added a disk to the guest and then created an ext4 FS on the disk. I then noticed that I couldn't perform fstrim operations. I then examined the xml and the only difference between this disk and the other disk in the system was the cache=none. So I removed cache=none and then shutdown/booted the guest. After the reboot all worked fine so I assumed it was the cache=none line. This was wrong. Actually it is the formatting of the filesystem. When i create an FS in the guest it disables discard. There are also some errors printed in /var/log/messages. Please see the output in file at the following location: http://dustymabe.com/content/qemu-devel-mail.txt Looks like it could be a bug (linux bug?) but I'm not sure. Thoughts? Dusty