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Improving disk performance?

I'm using OpenStack Diablo with KVM, and disk performance in the guest is not great. Are there any tips for better disk performance?

For example:

Turning on writeback caching is supposed to help (at the expense of reliability) Switching from ext4 to ext3 is supposed to be a big improvement Presumably the normal tricks like noatime etc will help Using a raw disk image rather than a qcow2 disk image could be faster Switching to a raw LVM partition should be much faster Mounting "scratch" space (presumably a separate LVM partition again) should be faster than using the root image

Does anyone have any experience with how to get better performance? Any recommended tweaks?