HP ProLiant Storage Server User Guide (440584-003, September 2007)

snapshot. Otherwise, the number of changes caused by the defragmentation process can cause shadow
copies to be deleted faster than expected. Note, however, that NTFS compression is supported only
if the cluster size is 4 KB or smaller.
NOTE:
To check the cluster size of a volume, use the fsutil fsinfo ntfsinfo command. To change
the cluster size on a volume that contains data, back up the data on the volume, reformat it using
the new cluster size, and then restore the data .
Mounted drives
A mounted drive is a local volume attached to an empty folder (called a mo unt point) on an NTFS
volume. When enabling shadow copies on a volume that contains mounted drives, the mounted drives
are not included when shadow copies are taken. In addition, if a mounted drive is shared and shadow
copies are enabled on it, users cannot access the shadow copies if they traverse from the host volume
(where the mount point is stored) to the mounted drive.
For example, assume there is a folder F:\data\users,andtheUsers folder is a mount point for G:\.
If shadow copies are enabled on both F:\ and G:\, F:\data is shared as \\ser ver1\data,and
G:\data\users is shared as \\server1\users. In this example, users can access previous versions of
\\server1\data and \\server1\users but not \\ser ver1\data\users.
Managing shadow copies
The vssadmin tool provides a command line capability to create, list, resize, and delete volume shadow
copies.
The system administrator can make shadow copies available to end users through a feature called
“Shadow Copies for Shared Folders.” The administrator uses the P roperties m enu (see Figure 7)to
turn on the Shadow Copies feature, select the volumes to be copied, and determine the frequency
with which shadow copies are made.
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