All the registered VSS writers - which you can view using the " vssadmin list writers" command - receive the request and prepare applications for backup by writing transactions from the memory to disk. This is what we want to explore.įirst, when using the VMware Snapshot Provider service in VMware Tools, you start the process of creating a new Volume Snapshot Service (VSS) snapshot inside the guest operating system (OS). Unfortunately, this description does not clarify what happens with the virtual machine during the process. This process might include such operations as flushing dirty buffers from the operating system's in-memory cache to disk, or other higher-level, application-specific tasks.” According to a VMware® Knowledge Base article, “Quiescing a file system is a process of bringing the on-disk data of a physical or virtual computer into a state suitable for backups.
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