Volume Shadow Copy Service Overview; File System Elements; File-Sharing Elements - HP 345646-001 - StorageWorks NAS 2000s External Storage Server Administration Manual

Volume Shadow Copy Service Overview

The Volume Shadow Copy Service (VSS) provides an infrastructure for creating point-in-time
snapshots (shadow copies) of volumes. VSS supports 64 shadow copies per volume.
Shadow Copies of Shared Folders resides within this infrastructure and helps alleviate data
loss by creating shadow copies of files or folders that are stored on network file shares at
pre-determined time intervals. In essence, a shadow copy is a previous version of the file or
folder at a specific point in time.
By using shadow copies, a NAS 2000s server can maintain a set of previous versions of all
files on the selected volumes. End users access the file or folder by using a separate client
add-on program, which enables them to view the file in Windows Explorer.
Shadow copies should not replace the current backup, archive, or business recovery system,
but they can help to simplify restore procedures. For example, shadow copies cannot protect
against data loss due to media failures, however, recovering data from shadow copies can
reduce the number of times needed to restore data from tape.
Detailed information on Shadow Copies can be found in Chapter 5 of this guide.

File System Elements

File system elements are composed of the folders and subfolders that are created under each
Logical Storage element (partitions, logical disks, and volumes). Folders are used to further
subdivide the available file system providing another level of granularity for management of
the information space. Each of these folders can contain separate permissions and share names
that can be used for network access. Folders can be created for individual users, groups,
projects, and so on.
Detailed information on file system elements can be found in Chapter 7 of this guide.

File-Sharing Elements

The NAS 2000s supports several file sharing protocols, including DFS, NFS, FTP, HTTP, and
Microsoft SMB. On each folder or Logical Storage element, different file sharing protocols
can be enabled using specific network names for access across a network to a variety of
clients. Permissions can then be granted to those shares based on users or groups of users in
each of the file sharing protocols.
Detailed information on file-sharing elements can be found in Chapter 7 of this guide.
NAS 2000s Administration Guide
Storage Management Overview
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