Chapter 5. Storage management 119
5.4  Archive Storage Manager for IBM i
The Disk Storage Manager of Content Manager OnDemand for i maintains a copy of 
documents on disk. Disk Storage Manager migrates documents from cache to the Archive 
Storage Manager (ASM). ASM then migrates documents to archive media.
ASM maintains one or more copies of documents on archive media, such as disk pool, optical 
(physical or virtual), or tape. The Content Manager OnDemand administrator decides the type 
of archive media that is required, configures the storage devices on the systems, and defines 
the storage devices to ASM. To store application group data on archive media, the application 
group must be assigned to a storage set that is managed by ASM.
When an application group is created, the Content Manager OnDemand administrator 
specifies how long the documents must be maintained on the system and whether the index 
data needs to be migrated from the database to archive media. Content Manager OnDemand 
system management programs use this information to migrate documents from cache to 
ASM, delete documents from cache, migrate index data from the database to archive media, 
and delete index data from the database. Content Manager OnDemand can then reclaim the 
space that was used by the migrated and expired data.
Disk Storage Manager expires data based on the Life of Data and Indexes value. Y ou can 
access this setting by clicking Application Group → Storage Management. ASM deletes 
data from the archive media when the data reaches its storage expiration date. The Content 
Manager OnDemand administrator defines management information to the ASM for the 
Content Manager OnDemand data that is managed. This management information includes 
storage volumes that can contain Content Manager OnDemand data, the number of copies of 
a report to maintain, and the amount of time to keep data in the archive management system.
5.4.1  Migration policy
Migration policies and storage sets must be defined before you can define reports to Content 
Manager OnDemand or load data into the system. Migration policies contain migration and 
storage media characteristics for data that is archived by using Content Manager OnDemand. 
The information is used by ASM to determine whether and when to move archived data 
through a hierarchy of storage media, such as disk, optical, or tape. Each step in the 
movement of data through this storage hierarchy is referred to as a migration policy storage 
level. Each migration policy must contain at least one storage level. Additional levels might be 
defined to meet your storage and retrieval requirements.
The Cache Only - Library Server storage set is no longer created automatically with the 
installation of Content Manager OnDemand for i. The “Cache Only” storage set is limiting 
because you cannot add any storage levels to it. A better alternative is to define a disk pool 
and create a migration policy instead. This approach provides the flexibility of adding 
additional storage levels to the policy later.
When you create a migration policy, a storage set of the same name is automatically created 
by Content Manager OnDemand. If you plan to keep all of your archives on disk, the best 
approach is to create a disk pool and to create a migration policy that specifies “No Maximum” 
for the duration level. Disk Storage Manager expires data and indexes whenever the number 
of days is reached in the Life of Data and Indexes setting in the application group, or 
whenever an expiration level in the migration policy is encountered, whichever comes first. If 
no expiration level is in the migration policy, data is only expired according to the Life of Data 
in the application group.