HP 3PAR Recovery Manager Software for VMware vSphere Licenses - Manual (Page 12)

operating system and applications and freezes I/O to the storage system to allow snapshot creation
(without the freeze function, data could become corrupted when the snapshot is taken because the
system might be in the middle of a task). Meanwhile, applications continue to run uninterrupted.
The original volume continues to change as the process continues, but the shadow copy of the
volume remains constant. VSS also gives permission to the backup application to access the volume
and back it up in its frozen state. The shadow copy volume is then used for the actual backup.
After VSS saves the shadow copy volume on the backup device, it deletes the shadow copy.
VSS coordinates between Requestors (backup applications such as Recovery Manager), Writers
(applications such as windows services like Exchange 2007) and Providers (components that create
the shadow copies).
Table 2 VSS Components
VSS Component Description VSS Component
The requestor is backup software that initiates the creation
of the shadow copy. Requestor
The writer is any application software that participates in
the shadow copy process and whose files and data are
included in the process. Writer
The provider is the storage technology that does the actual
shadow copy. Provider
Supported VSS Components
VSS components currently supported by HP 3PAR VSS Provider Software for Microsoft Windows
include:
•
Requestor
Recovery Manager ◦
◦ Symantec NetBackup for Microsoft Windows
◦ HP Data Protector for Microsoft Windows
•
Writer - Microsoft Exchange 2007
12 Overview of Recovery Manager