Placement policies

This topic describes how to create placement policies to control where the data is placed.

Context

Most rules in SAN File System policies are about placement. After an administrator has made choices about the administrative characteristics of the user storage pools used by the cluster, those characteristics are exploited through placement rules. This is accomplished by defining a rule that states if the following condition is met, set the file's storage pool to be X.

Files are often assigned to policies based on file names.

Files are placed in storage pools only when they are created. Changing the rules that apply to a file's placement does not cause the file to be moved.

Before migrating data, you must prepare the cluster for the addition of new files. When a SAN File System cluster is installed, there is an existing policy set called DEFAULT_POLICY. This policy has no rules: therefore, any SAN File System file created in any fileset goes to the default storage pool. You can list this policy set, get the rules, and you can activate it using either the administrative CLI or the SAN File System console. You cannot modify or delete it.

Parent topic: Configuring SAN File System

Library | Support | Terms of use | Feedback
(C) Copyright IBM Corporation 2003, 2004. All Rights Reserved.
IBM TotalStorage SAN File System v2.2