Storage volumes and libraries
Estimating the amount of archive storage required to hold your reports also helps you determine the number of archive storage volumes that you need to plan for.
In previous examples, approximately 244 GB of archive storage space is required. Assuming that the formatted capacity of a 5.25 inch optical storage volume is about 30 GB , you would need approximately 8 storage volumes to hold the data for 10 years.
- If you use Tivoli® Storage Manager to maintain Db2® backup image files and archived log files, it is recommended that you dedicate a library for that purpose.
- If you need to maintain a backup copy of the reports that you store on archive storage, and the archive storage manager that you are using supports it, it is recommended that you store the backup copy in a different library than the primary copy.
It is possible to reduce the number of storage libraries by removing storage volumes from a library and placing them in offline storage. For example, you might find that you can remove a storage volume from a library one year after the last time that Content Manager OnDemand stored data on or retrieved data from the storage volume. The archive storage manager should provide commands that you can use to determine when a storage volume was last written to or read from and to dismount a storage volume from a library. Before report data can be retrieved from an offline storage volume, an operator must usually locate the storage volume and mount it in the library.
You can also reduce the number of storage libraries by storing different types of reports in the same library. The archive storage manager usually uses one management policy to maintain all data stored in a library. The management policy determines the length of time that the archive storage manager maintains data in the library.