SAN File System provides automatic file placement at the time of creation through the use of policies and storage pools. You can create quality-of-service storage pools that are available to all users and define rules and policies that cause newly created files to be placed in the appropriate storage pool automatically.
A policy is a list of rules that determines where the data for specific files is stored. A rule is an SQL-like statement that tells a metadata server to place the data for a file in a specific storage pool if the file attribute that the rule specifies meets the specified criteria. A rule can apply to any file being created or to only files being created within a specific fileset depending on how it is defined.
The rules in a policy are processed in order until the condition in one of the rules is met. The data for the file is then stored in the specified storage pool. If none of the conditions specified in the rules of the policy is met, the data for the file is stored in the default storage pool.
Parent topic: Storage management
Related concepts
Storage pools
Related tasks
Activating a policy
Creating a policy
Creating a storage pool
Changing the rules in a policy