222 IBM Content Manager OnDemand Guide
Figure 10-2   Data, resource, and index storage and expiration scenarios
Scenario 1: Cache only, then expiration
In this scenario, the storage object is stored to cache only and it is expired from cache after a 
predetermined period. Typically, this methodology is employed under the following 
circumstances:
/SM590000The life of the data is short, and hierarchical storage management (HSM) is not necessary.
/SM590000The life of the data is long, and a backup process exists for the data in cache.
/SM590000The cache device is large enough to hold the total archived data, and the cache device is 
reliable and performs well.
This method is enabled by selecting a cache-only storage set and entering a number in the 
Cache Data for __ Days field. 
When you select a cache-only storage set, Content Manager OnDemand automatically sets 
Migrate Data from Cache to No and sets the Expire in __ Days field to the same value as the 
Cache Data for __ Days field. (The default value is 90 days.) 
Selecting a cache-only storage set requires the creation of backup and data management 
systems that are external to the Content Manager OnDemand system.
Scenario 2: Cache, then migration to storage, and then expiration
In this scenario, the storage object is first stored to cache for a short period, after which it is 
migrated to a storage manager for long-term storage. 
Cache-only storage: If the storage set contains cache-only storage nodes, ensure that 
the Cache Data value and the Life of Data and Indexes value are the same. Otherwise, the 
add or update operation cannot be completed.
Sto rage
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Storage
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Sto rage
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Sto rage
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Cach e Ex pire in
5 yea rs1
Cach e Mi gr at e in
90  d a ys
Storage
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Ex pire in
5 yea rs2
Storage
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Ex pire in
5 yea rs3
Cach e Expire after
90  days
Storage
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Ex pire in
5 yea rs4
Indexe s
Appli cation  Grou p
Data tabl es
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P rocess
Report Data
do cumen ts
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