HP StorageWorks X1600 12TB SATA Network Storage System User's Guide download pdf (Page 65)

Shadow copies and drive defragmentation

When running Disk Defragmenter on a volume with shadow copies activated, all or some of the

shadow copies may be lost, starting with the oldest shadow copies.

If defragmenting volumes on which shadow copies are enabled, use a cluster (or allocation unit) size

of 16 KB or larger. Using this allocation unit size reduces the number of copy outs occurring on the

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 mount 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, and the Users folder is a mount point for

G:\. If shadow copies are enabled on both F:\ and G:\, F:\data is shared as \\server1\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 \\server1\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 Properties menu (see Figure 22) 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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HP StorageWorks X1600 12TB SATA Network Storage System User's Guide Page 65