Replicating nodes in a multiple-server environment

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If the primary IBM Storage® Protect server for the space management client is unavailable, you can manually configure the client to connect to a failover server. You can recall files from the failover IBM Storage Protect server but cannot migrate files to the failover server. When node replication is used on the IBM Storage Protect failover server, you can restore files from the failover server. However, restoring stub files from the failover server is not supported. Instead of restoring the stub files, the resident files are restored. In such a case, when you reconfigure HSM to connect to a failover server, the dsmmigundelete and dsmreconcile commands are not supported.

Before you begin

The primary IBM Storage Protect server for the space management client must be one that replicates client node data.

In a multiple-server environment, each IBM Storage Protect server includes storage pools for backup and migration. All pools used for backup and migration must be replicated to the same secondary server.

About this task

The IBM Storage Protect server that the client connects to during normal production processes is called the primary server. When the primary server is set up for node replication, the data for client nodes can be replicated to the failover server.

The backup-archive client can automatically fail over to the failover server when it is configured for failover.

However, the space management client does not automatically fail over to the failover server. You must manually edit the dsm.sys file to connect to the failover server. Any failover server information in the replservername stanza and myreplicationserver option is ignored by the space management client.

Procedure

  1. Stop the backup and HSM processes on the IBM® Storage Scale cluster.
  2. Edit the dsm.sys options file.
    1. Change the value of the servername option from the primary server to the secondary server.
    2. Do not change the name of the server stanza.
  3. Start the HSM processes on the IBM Storage Scale cluster.

Results

Functions that require write access to the failover IBM Storage Protect server are not available for a space-managed file system. You cannot back up, archive, or migrate files to the failover server from a space-managed file system. You can restore, retrieve, and recall from the failover server.

With the backup-archive client, you cannot restore migrated files as stub files. Migrated files can be only restored as resident files.

What to do next

To switch back to the primary IBM Storage Protect server, repeat the steps, but change the value of the migrateserver option from the target server to the source server.