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Hrm... That was the wrong way to word it. What I meat to say: I really wish these VMs could use more than 1 of my cores each!

Great. Thanks for the help, I'm going to try all of this, Dietmar. Now I just need to talk our XFS-pushers down.

Cool. Does it allow live snapshots for backup?

Hrm, I guess I spoke too soon. I've changed config on all machines (2003/2008 servers, mix of 32 and 64 bit) to 1 socket / 1 core, and clock skew issues are gone. Too bad! Now I have tons of idle cores just waiting to be used :)

Are there any performance advantages to qcow2 over raw? I remember trying raw once, and being very dissapointed with the performance the guest OS reported on the "block device" compared to qcow2. Anyone have any experience with this? If raw actually has no performance disadvantage, then raw...

A bit more information, which doesnt make any sense to me: On a tip from another forum, I mounted XFS volume with mount option (allocsize=1024m), which means the file system _should_ allocate in 1GB blocks. However, after just a bit of growth in one qcow2, I went from 16 extents for 8 files, to...

I'm having clock skew issues in 1.4b2 in Windows Server 2003 and 2008, both SMP and single-socket kvm configs (if that matters), on the following hardware: Dual Xeon 5320 (1.86ghz) Speedstep OFF 12GB DDR FB-DIMM

Is there any way to make qcow2 images preallocate space upon creation? Using new storage model, I'm storing disk images in an XFS filesystem (mounted directory), and it's getting super fragmented with these sparse/growing images! Alternately, does anyone have any tips for formatting/mounting...

How is SMP stability for Windows guests these days? I know it was poor about a year ago, but haven't seen much since. If it's good, does performance scale well with multiple cores (in software that typically takes advantage of multiple hardware cores)?