Hp ProLiant DL160 G5 Storage-Server User Manual download pdf (Page 58)

is important. The same performance characteristics on numbers of reads and writes apply when using

fault-tolerant configurations, as is the case with controller-based RAID. These volumes can also be

assigned drive letters or be mounted as mount points off existing drive letters.

The administrator should carefully consider how the volumes will be carved up and what groups or

applications will be using them. For example, putting several storage-intensive applications or groups

into the same dynamic disk set would not be efficient. These applications or groups would be better

served by being divided up into separate dynamic disks, which could then grow as their space

requirements increased, within the allowable growth limits.

NOTE:

Dynamic disks cannot be used for clustering configurations because Microsoft Cluster only supports basic

disks.

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.

File sharing elements

The storage server supports several file sharing protocols, including Distributed File System (DFS),

Network File System (NFS), File Transfer Protocol (FTP), Hypertext Transfer Protocol (HTTP), and

Microsoft Server Message Block (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.

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 storage 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.

Storage management overview58

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Hp ProLiant DL160 G5 Storage-Server User Manual Page 58