Restoring a Data Grid

To restore a data grid, the following entities must be restored:
  • The primary realm server’s database
  • The grid configuration in the realm server
  • The state keepers
  • The nodes of each copyset

Procedure

  1. Determine the ActiveSpaces checkpoint to use for restoring the data grid.
  2. Determine the Realm Server database backup associated with the checkpoint.
  3. Stop all data grid processes. For example, clients, proxies, nodes, state keepers, tibdgadmind.
  4. Stop all realm servers. For example, primary, backups, and satellite servers.
  5. Copy each node's checkpoints directory to a safe place.
  6. Restore the primary realm server's database from the backup associated with the checkpoint.
  7. Restart any other realm servers.
  8. Restore the following processes:
    1. Restore the grid configuration in the primary realm server from the ActiveSpaces checkpoint. This is to ensure that the grid configuration is consistent as realm server database is backed up outside of our checkpoint process. Remember that the operations such as adding or deleting a table are not synchronized.
    2. Restore the state keepers from the checkpoint. Ensure all state keepers are running.
    3. Restore each node from its respective checkpoint data directory. Ensure all nodes are running.
  9. Restart the following items:
    1. Restart any remaining data grid processes such as tibdgadmind, or proxies.
    2. Restart ActiveSpaces clients.
    If a restore to a checkpoint which is not the latest is performed, the files are removed from each node's checkpoints subdirectory for the checkpoints taken after the checkpoint is being restored. Therefore, it is important to save each node's checkpoints subdirectory prior to the restore in case you decide you needed to restore from a later checkpoint.
  • Realm Server Database Restore
    After a backup of the primary realm server is created, you can restore the realm server from the backup by using this procedure.
  • Realm Server Checkpoint Restore
    When an ActiveSpaces checkpoint is created for a data grid, the data grid's configuration from the realm server is saved as part of that checkpoint.
  • Restoring State Keepers
  • Restoring a tibdg Node
    When restoring the nodes of a data grid, all nodes must be restored using the same checkpoint to ensure a consistent state between the primary and secondary nodes of each copyset and between copysets.