Preparing for disaster recovery involves the following major steps:
- Identify the volumes and groups that contain important files and data for disaster recovery.
- Create TrueCopy pairs, paying special attention to the options in P-VOL Fence Level Settings to ensure that the system responds the way you want in the event of a failure (see Allowing I/O to the P-VOL after a split: Fence Level options).
- Install and configure host failover software between the primary and secondary sites.
- Establish file and database recovery procedures. These procedures for recovering volumes due to control unit failure must already be in place.
- Make sure that the host system at the primary site is configured to receive sense information from the primary storage system (for example, using SNMP). This must also be done at the secondary site if a host is connected to it.
Note: Procedures for disaster recovery involve
releasing pairs. However, when using CCI you can perform disaster recovery without releasing
pairs. To do this, when setting up TrueCopy, add
remote paths between the secondary system and primary system. Then add a remote
connection from the secondary system CU to the primary system CU. Use the
same path group ID as you used from the primary to secondary system connection.
Remote copy and disaster recovery procedures are complex. Consult customer support on sense-level settings and recovery procedures.