7.1 Replicating Branches of the Primary File Tree in the Secondary File Tree

You can create a global policy to control when branches in the primary file tree are replicated to the secondary file tree.

The NSS filesystem is DST aware for new volumes, so the primary volume directory tree structure will always be replicated on the shadow volume directory tree structure. A configurable option called Replicate Primary Tree to Shadow is by default set to 1, so when the existing NSS volumes are configured as primary volume for DST, the primary volume directory tree structure will get replicated to the shadow volume directory tree.

IMPORTANT:If you use shadow volumes in a cluster, ensure that you set the same global policies on each OES node in the cluster.

Valid settings for the Replicate Primary Tree to Shadow are:

  • Disabled (0): Branches in the existing primary volume are not replicated to the new secondary volume when the existing volume is configured as a primary volume of the DST. It is replicated as needed when data is moved from the primary storage area to the secondary storage area.

  • Enabled (1, default): Branches in the existing primary volume are replicated to the new secondary volume when the existing volume is configured as a primary volume of the DST.

To configure the Replicate Primary Tree to Shadow parameter:

  1. Log in as the root user to OES Remote Manager.

  2. Select Manage NCP Services > Manage Server to view the Server Parameter Information.

  3. Click the link for the REPLICATE_PRIMARY_TREE_TO_SHADOW setting.

  4. In New Value, do one of the following (applicable when the existing volume is configured as primary volume of the DST):

    • Disable Immediate Path Replication: Type 0 to stop replicating the paths in the existing primary volume directory structure to the new secondary volume directory structure. Paths are replicated as they are needed when the data is actually moved to the secondary storage area.

    • Allow Immediate Path Replication: Type 1 to replicate all paths in the existing primary volume directory structure to the new secondary volume directory structure.

  5. Click Change.

  6. On the Server Parameter Information page, verify that the new setting is displayed for the REPLICATE_PRIMARY_TREE_TO_SHADOW parameter.

For information about using the SET command to modify this global policy, see Section A.4, Configuring Global DST Policies by Using the SET Command.