3.5.1 Matrix Server Administration Guide

Chapter 10: Manage Hardware Snapshots 189

HP EVA Storage Arrays

To take hardware snapshots on Hewlett-Packard StorageWorks

Enterprise Virtual Array (EVA) storage arrays, the latest version of the HP

StorageWorks Scripting System Utility (SSSU) must be installed on all

servers in the cluster. Also, the latest version of CommandView EVA

software must be installed on your Management Appliance. Be sure that

your versions of SSSU and CommandView EVA are consistent. The SSSU

utility must be renamed, or linked, to /usr/sbin/sssu, and must be

executable by all users. To locate this software, contact your Hewlett-

Packard representative.

Create a Snapshot or Snapclone

A snapshot is a space-efficient reflection of a source filesystem at a

particular point in time. Snapshots initially consume storage space only

to store pointers to the data in the source filesystem, growing in size

when source filesystem data is changed. Snapshots can be fully-allocated

(the maximum amount of storage space is reserved at creation time), or

demand-allocated (the minimum amount of storage space is reserved at

creation time, allocating more as necessary). Snapshots are intended to be

temporary.

A snapclone is similar to a snapshot, except that it completely copies the

source filesystem data at a particular point in time. When you create a

snapshot, you can specify whether you want a fully-allocated snapshot, a

demand-allocated snapshot, or a complete-copy snapclone.

NOTE: Snapclones are not supported on Engenio storage arrays.

Snapshots can be both readable and writable and there can often be

multiple snapshots of a filesystem existing at the same time.

To create a snapshot, select the filesystem on the Management Console,

right-click, and select Create Snapshot. (The filesystem must be

mounted.) You will then see a dialog asking for information specific to

your storage array.