A Storage Replica node hangs when creating snapshots

When creating a VSS snapshot (through backup, VSSADMIN, etc) a Storage Replica node hangs, and you must force a restart of the node to recover. There is no error, just a hard hang of the server.

This issue occurs when you create a VSS snapshot of the log volume. The underlying cause is a legacy design aspect of VSS, not Storage Replica. The resulting behavior when you snapshot the Storage Replica log volume is a VSS I/O queing mechanism deadlocks the server.

To prevent this behavior, do not snapshot Storage Replica log volumes. There is no need to snapshot Storage Replica log volumes, as these logs cannot be restored. Furthermore, the log volume should never contain any other workloads, so no snapshot is needed in general.