Calling any VM gurus...
Ok, I am trying to decipher the VCB Manual right now. I am wanting to
make sure I am correctly grasping the concepts and sequences of events
that occur during a VCB Backup that utilize Custom Quiescing Scripts.
Let me see if I have this right:
Example VM: Exchange 2003
vcbmounter.exe is called
Pre-Backup Script is invoked
Runs a pre-freeze script in the VM, C:\Windows\pre-freeze-script.bat
(Custom Quiescing Script)
Shuts down the Information Store, allowing a quiesced snapshot
of the Database
Engages SYNC driver to do it's magic, flushing I/O and dirty
data, making file system consistent.
Quiesces NTFS, ensures that no file system writes are pending at the
time the snapshot is taken, allowing the creation of file-system
consistent backups
Snapshot is created
Unquiesces NTFS
Disengage SYNC drivers
Runs a post-thaw script in the VM, C:\Windows\post-thaw-script.bat
(Custom Quiescing Script)
Starts Information Store
Exports the virtual machine snapshot, disks, and configuration files to
a local directory on the VCB proxy
Snapshots are unmounted
Backup software graps the files that VCB exported.
End result: An image-level backup that are file AND database
consistent, as apposed to being crash-consistent, correct?
Question: SYNC seems to be optional, does it have to be enabled in this
senario?
Thanks!
Sam Cayze
Information Technology Administrator
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