Re: [Veritas-bu] VSP Clarification
2010-03-12 22:37:20
Assuming you haven't turned off open file backups or switched to volume shadow
copy (not available in Windows 2000) then anytime you run a windows file system
backup it will create a snapshot file on the root of the drive you are backing
up. The cache file is created via a file filter driver (which is why you have
to reboot Windows 2000 after installing the client.) The file is hidden so you
can't see it in Windows Explorer by default and occasionally a failed backup
with the 5.1 client will forget to remove this file after the backup fails.
(They can be quite large). You can change the default behavior of this file,
how big it is and which drive is used to create the cache. in the client
properties. You don't actually see the virtual drive, or at least I have never
seen the virtual drive.
-Jonathan
________________________________
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu on behalf of Jimenez,
Daniel
Sent: Fri 3/12/2010 8:20 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] VSP Clarification
Hey guys
I was reading the VSP overview for Netbackup 6.5 and was a little confused on
the virtual drive creation and the VSP cache file creation. Where is the
virtual drive created? And what exactly is inside the VSP cache file. I read
through the documentation but still unclear on these things so anyone that can
put this piece of the documentation into layman's terms I would appreciate it,
thanks.
VSP overview
NetBackup uses VSP to back up open and active files on Windows 2000, Windows
XP, and Windows Server 2003 (32- and 64-bit) clients. For VSP to back up open
and active files, VSP first captures a snapshot of each volume to be backed up.
A virtual drive is created that represents a static copy of the volume at a
point-in-time. A corresponding VSP cache file is also created. NetBackup backs
up files using the virtual drive instead of the actual drive. For each volume
snapshot, a VSP cache file is created to maintain the integrity of the
snapshot. The cache file stores the original data that reflects the changes
that occurred during the backup. The cache file is created along with the
volume snapshot.
Daniel Jimenez
Data Protection
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