Installation and User's Guide

Chapter 9. Storage management policiesStorage management policies are rules your administrator defines in order tomanage your backups and archives on the server.Your data is associated (or bound) to these policies; then when the data is backedup or archived, it is managed according to policy criteria. Policy criteria include apolicy domain, a policy set, a management class, and a copy group.Policies determine:v Whether a file is eligible for backup or archive services.v How many backup versions to keep.v How long to keep inactive backup versions and archive copies.v Where to place the copies in storage.v For incremental backup, policies also determine:– How frequently a file can be backed up.– Whether a file must change before it is backed up again.This topic explains:v Policy criteria (policy domains, policy sets, copy groups, and managementclasses).v How to display policies.v How Tivoli Storage Manager associates your data with policies.Policy domains and policy setsA policy domain is a group of clients with similar requirements for backing up andarchiving data.Policy domains contain one or more policy sets. An administrator uses policydomains to manage a group of client nodes in a logical way.For example, a policy domain might include:v A department, such as Accounting.v A physical location, such as a particular building or floor.v A local area network, such as all clients associated with a particular file server.Tivoli Storage Manager includes a default policy domain named Standard. At first,your client node might be associated with the default policy domain. However,your administrator can define additional policy domains if there are groups ofusers with unique backup and archive requirements.A policy set is a group of one or more management classes. Each policy domain canhold many policy sets. The administrator uses a policy set to implement differentmanagement classes based on business and user needs. Only one of these policysets can be active at a time. This is called the active policy set. Each policy setcontains a default management class and any number of additional managementclasses.© Copyright IBM Corp. 1993, 2010 235