HP 345646-001 - StorageWorks NAS 2000s External Storage Server, Administration Manual

Page: 82 / 200

Shadow Copies
82 NAS 2000s Administration Guide
Shadow Copy Planning
Before setup is initiated on the server and the client interface is made available to end users,
consider the following:
■
From what volume will shadow copies be taken?
■
How much disk space should be allocated for shadow copies?
■
Will separate disks be used to store shadow copies?
■
How frequently will shadow copies be made?
Identifying the Volume
Shadow copies are taken for a complete volume, but not for a specific directory. Shadow
copies work best when the server stores user files, such as documents, spreadsheets,
presentations, graphics, or database files.
Note: Shadow copies should not be used to provide access to previous versions of application or
e-mail databases.
Shadow copies are designed for volumes that store user data such as home directories and My
Documents folders that are redirected by using Group Policy or other shared folders in which
users store data.
Shadow copies work with compressed or encrypted files and retain whatever permissions were
set on the files when the shadow copies were taken. For example, if a user is denied permission
to read a file, that user would not be able to restore a previous version of the file, or be able to
read the file after it has been restored.
Although shadow copies are taken for an entire volume, users must use shared folders to
access shadow copies. Administrators on the local server must also specify the
\\servername\sharename path to access shadow copies. If administrators or end users want to
access a previous version of a file that does not reside in a shared folder, the administrator
must first share the folder.
Note: Shadow copies are available only on NTFS, not FAT or FAT32 volumes.
Files or folders that are recorded by using Shadow Copy appear static, even though the original
data is changing.