Chapter 5. Storage management 125
In the Migration Policy Storage Level Definition window (Figure 5-22 on page 124), you 
provide the following information for the new policy storage level: 
/SM590000Level identifier: This field distinguishes the different storage levels within the migration 
policy. The value must be unique within the storage levels of the migration policy. ASM 
uses the level identifier to determine the current level of the migration hierarchy and to 
determine the next level to which the data must be moved. The identifier can be numeric 
(for example, 10, 20, and 30) or descriptive (for example, ASP or OPT).
/SM590000Disabled: Specifying this option causes ASM to skip this level in the storage hierarchy. The 
Disabled option can be used in a situation where an optical unit is added to the system 
later, but the administrator wants to add an optical policy level and disable it. 
This option can also be used when migration to a policy level is discontinued, such as a 
tape unit. A policy level cannot be removed if data is archived to it, but it can be disabled 
so that no more data is migrated to that level.
/SM590000Description of the policy level: Use this field to provide a description of the policy level.
/SM590000Primary media type: The types from which you can choose are optical, tape, disk, or 
expire. If you select expire as the last policy level, when data reaches this level in the 
migration sequence, it is removed from the archive system even if the retention period that 
is specified in the application group is not exceeded. It is not necessary to specify an 
expire level. Instead, you can let the data expire when it exceeds the number of days that 
are specified in the Life of Data and Indexes in the application group.
/SM590000Duration at this level: In this field, you specify either no maximum or a specified number of 
days before ASM moves the data to the next level in the migration sequence.
/SM590000Primary storage group: Select the storage group that you want to use to store the data at 
this level.
/SM590000Create backup copy and backup storage group: Y ou select these options if you want ASM 
to create a backup copy of the data when it moves to this policy level. The backup storage 
group must be created with a media type of backup.
/SM590000Stage to disk when data is retrieved from tape and the duration on disk in days: Choose 
these options to cache data that is returned from tape to disk for the number of days that 
are specified.
In our scenario, we created a policy level that stores data for 100 days on disk by using the 
disk pool storage group that is assigned to auxiliary storage pool 1. We also created a policy 
level that stores data on optical storage indefinitely and uses the REPORTS optical storage 
group. We did not include an expire level, so the data always expires according to the Life of 
Data and Indexes in the application group. We can use this migration policy for all application 
groups if we choose. Documents that are in application groups with the Life of Data set to 100 
days or fewer are never migrated to optical because the disk pool storage level specifies 100 
days. This approach is easy to manage.
Figure 5-23 on page 126 shows the final migration policy structure.