On Wed, Mar 2, 2011 at 9:23 AM, Richard W.M. Jones <rjones@xxxxxxxxxx> wrote: > On Tue, Feb 22, 2011 at 02:51:50PM -0500, Josef Bacik wrote: >> 2) Fedora 16 ships without LVM as the volume manager and instead use >> BTRFS's built in volume management, again just for the default. > > Sorry I'm a bit late on this gentle discussion, but I have one > question about this: > > I use LVM to store virtual machines, one VM per LV, and it's very good > for that. > > How is BTRFS's performance when used to store VMs (presumably they are > stored as files)? > Good, but the problem is the default behavior of virt manager is to use fsync for everything, you have to manually go in and set the "Cache" to "None" so it will use O_DIRECT, and then it's just as fast as anything else. Not a big deal if you create everything via the command line, kind of annoying if you do it via the GUI, tho all you have to do is say "let me edit the options before starting this vm" when you first create it, set the cache type and then do the install and you are good to go. Thanks, Josef -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
