Creating multiple log file copies

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Backing up multiple copies of a log file in a single archive operation helps protect against this data in the event of a storage hardware failure or disaster recovery situation. These copies can be on different physical IBM Storage Protect™ volumes or on different IBM Storage Protect servers.

When a log file copy is unavailable at restore time, the software switches to another copy, and continues to restore the log file from that copy. To create multiple backup copies of a log file, complete the following steps:
  1. Open the Data Protection for SAP profile.

    The default directory and profile name is /usr/sap/<SID>/SYS/global/hdb/opt/hdbconfig/init<SID>.utl

  2. Enter the keyword REDOLOGS_COPIES, and specify the number of backup copies that are required for the redo logs.
  3. (Optional) Adjust the number in the MAX_SESSIONS keyword. This keyword specifies the maximum number of sessions that a single Data Protection for SAP instance has on the IBM Storage Protect server.
  4. In the server stanza, search for the BRARCHIVEMGTCLASS keyword, and ensure that there are as many archive management classes specified as there are redo log copies that are requested.

If you distribute the redo log copies to more than one IBM Storage Protect server, the management classes for all server stanzas must be greater than or equal to the number of redo log copies. Data Protection for SAP requires that the maximum number of sessions, which are defined by MAX_SESSIONS, is greater than or equal to the number of redo log copies that are requested. A setup with a smaller number of sessions is not advised with the backint interface.