Storage hierarchy

There are several different storage management strategies that you can use with Content Manager OnDemand.

For example, Content Manager OnDemand allows data to be migrated from one storage media type to another using criteria defined by an administrator. Disk storage should be used for high-speed access to reports. When you load a report on the system, Content Manager OnDemand can automatically store one copy of the report on disk and another copy of the report on archive storage media. Content Manager OnDemand also supports the option of storing reports on disk and then later migrating them to archive storage. However, we recommend that you always plan to copy reports to disk and archive media at the same time (when you load the report). Doing so usually eliminates the need for you to periodically backup disk storage, because a backup copy of your reports already exists on archive media. Copying reports to cache storage and archive storage at the same time also eliminates the need for you to migrate reports to archive media later.

Reports expire (are eligible to be removed) from disk when they reach their disk expiration date. You specify the disk expiration date for a report when you create an application group. For example, you can specify that a report should expire from disk after it has been stored there for ninety days. Content Manager OnDemand provides a command that you can use to automatically remove expired reports from disk on a regular schedule. After you run expiration processing, Content Manager OnDemand reclaims the space taken by expired documents.

Content Manager OnDemand maintains documents on disk and on archive media independently of each other until the documents expire. Each use their own criteria to determine when to expire and delete data; each use their own commands to remove documents. You need to decide how data will be expired from your system and consistently apply those standards when creating your application groups and migration policies.