> "More interesting is e.g. Hyper-V using this to snapshot the guest VMs." It can run through VMware tools into virtual machines, too, and down a layer to SAN

> "More interesting is e.g. Hyper-V using this to snapshot the guest VMs." It can run through VMware tools into virtual machines, too, and down a layer to SAN storage and trigger a SAN snapshot so that a backup system like Veeam can take data from the SAN while knowing the guests two levels higher flushed data before the snapshot was taken. or e.g. here Nimble SAN can talk up to servers through VSS to trigger SQL Server quiesce before they take a SAN snapshot: https://infosight.hpe.com/InfoSight/media/cms/active/public/tmg_HPE_Nimble_Storage_Deployment_Considerations_for_Microsoft_SQL_Server_doc_version_family.whz/oaq1491942206687.html https://infosight.hpe.com/InfoSight/media/cms/active/public/...