Chapter 10. Migration and expiring data and indexes 221
The object size is defined by clicking Advanced on the Storage Manager tab of the 
Application Group window. The object size is the size of a storage object in kilobytes (KB). By 
default, Content Manager OnDemand segments and compresses report data into 10 MB 
storage objects. For most use cases, the default value is appropriate. Valid values are 
1 KB - 150 MB. 
The storage objects are stored in storage sets. The storage sets contain one or more primary 
storage nodes. The storage node points to the location where the data is stored, which can be 
cache, the storage manager (Tivoli Storage Manager, object access method (OAM), or 
Archive Storage Manager (ASM)), or a combination. 
The primary storage nodes can be on one or more object servers. When the Load Type is 
Local, Content Manager OnDemand loads data on the server on which the data loading 
program runs in the primary storage node with the Load Data property specified. If the Load 
Type is Local, and the storage set contains primary nodes on different object servers, you 
must select the Load Data check box for one primary node on each object server.
The storage set must support the number of days that you plan to maintain reports in the 
application group. For example, if you must maintain reports in archive storage for seven 
years, the storage set must identify a storage node (or migration policy on an IBM i server) 
that is maintained by ASM for seven years. 
A detailed description of adding storage sets and storage nodes is in Chapter 5, “Storage 
management” on page 89 and the related OnDemand Administrative Guide.
10.2.1  Storing the report (document) data 
To improve efficiency and scalability, stored documents are embedded within storage objects. 
The storage objects are then stored in cache or a storage manager (OAM, Tivoli Storage 
Manager, or ASM). The storage objects are eventually expired from the system based on 
values that are defined by the Content Manager OnDemand administrator. In this section, we 
describe each scenario and how it is implemented. The parameters that are described in this 
section are on the Storage Manager tab of the Application Group window unless otherwise 
specified.
Three sets of data are stored when you load a report: 
/SM590000Index data, which is extracted by the indexing program and used by the search process
/SM590000Resources, such as an overlay and fonts, which are used to customize the viewed data
/SM590000Documents (or report segments) that will be viewed
Figure 10-2 on page 222 shows the datasets and illustrates four scenarios of their storage 
and expiration.
Object size value: Exercise caution when you change the object size value. Specifying 
too large or too small a value can adversely affect performance when you load data.