In the cause of daily VM backups (actually with VDP, but that should not matter), we incidentally got msg.snapshot.error-QUIESCINGERROR when the backup is creating snapshots, and then, after a short time, the VMs will freeze: you can ping them, but any other interaction is impossible, and we eventually need to power-cycle them.

VMWare support recommended to set the following:

enableSyncDriver = false
There seem to be quite a few linux users experiencing this freeze, and it seems to have to do with the vmsync driver

"causing a deadlock if vmsync is used during a VMware Snapshot with quiesce enabled. The source of the deadlock occurs because of a problem with the FIFREEZE/FITHAW ioctl() feature within the Linux guest that is utilized to quiesce the filesystem."

Does anybody have an insight deep enough to judge if this is likely to be addressed by either open-vmtools engeneering, or SLES engeneering?

"enableSyncDriver = false" may help, but it includes a risk of inconsistencies in the backup.

Thanks, Thomas