On Wed, Jun 29, 2011 at 07:23:31AM -0500, Anthony Liguori wrote: > Which file system on the host?
Any filesystem. Although extN and btrfs are particularly bad. > At any rate, I'm a big fan of making wce tunable in the guest and then I > think setting wce=1 is quite reasonable to do by default. Note that this means a manual override during each boot. Windows and modern Linux just use what's available. Only Solaris with ZFS actually turns WCE on if it's not set AFAIK. And to me it's a rather questionable behaviour at least for SCSI disks where the admin might have chosen those intentionally. (unlike ATA disks SCSI allows to store the setting permanently)
