Il 04/06/2013 03:02, Dusty Mabe ha scritto: > 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
Please attach the QEMU command line too. I'll try to reproduce. Paolo
