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download PDF document: hv_vss_daemon.8.pdf

HV_VSS_DAEMON(8) FreeBSD System Manager's Manual HV_VSS_DAEMON(8)
NAME hv_vss_daemon - Hyper-V Volume Shadow Copy Service Daemon
SYNOPSIS hv_vss_daemon [-dn]
DESCRIPTION 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.
SEE ALSO hv_vmbus(4), hv_utils(4), hv_netvsc(4), hv_storvsc(4), hv_kvp(4)
HISTORY The daemon was introduced in October 2016 and developed by Microsoft Corp.
AUTHORS FreeBSD support for hv_vss_daemon was first added by Microsoft BSD Integration Services Team <bsdic@microsoft.com>.
FreeBSD 14.2-RELEASE October 12, 2016 FreeBSD 14.2-RELEASE