hv_vss_daemon(8) manual page

The hv_vss_daemon daemon provides the ability to freeze and thaw the file system for FreeBSD guest partitions running on Hyper-V.

Hyper-V allows administrators to backup or restore the FreeBSD guest partition. Administrators can use Windows Powershell scripts to backup or restore the FreeBSD VM.

The hv_vss_daemon accepts file system freeze and thaw requests from the hv_utils(4) driver and performs the actual file-system operation.

The file system freeze and thaw functionality is useful when the Hyper-V host wants to do live backup of FreeBSD guest. Hyper-V host sends file system freezing request to hv_vss_daemon which conducts the real operation. After successfully freezing file system, Hyper-V host takes a snapshot of the VM. In the future, Hyper-V host can restore the FreeBSD VM through that snapshot.

The options are as follows:

-d

Run as regular process instead of a daemon for debugging purpose.

-n

Generate debugging output.

“	If you sat a monkey down in front of a keyboard, the first thing typed would be a unix command.	”
— Bill Lye

Manual Pages — HV_VSS_DAEMON

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-d
	Run as regular process instead of a daemon for debugging purpose.
-n
	Generate debugging output.