Table of ContentsView in Frames

Data replication using tape

You can replicate data from the SnapMirror source to the destination storage system using tape. You can use the smtape backup command to backup data from the source and the smtape restore command to restore data to the destination.

In this scenario, you want to establish a SnapMirror relationship between a source system and a destination system over a low-bandwidth connection. Incremental Snapshot mirroring from the source to the destination over the low bandwidth connection is feasible, but the initial base Snapshot mirroring is not.

In such a case, it might be faster to first transfer the initial base Snapshot image from source to destination using tape, and then set up incremental SnapMirror updates to the destination system through the low-bandwidth connection.
This scenario uses the following configuration:
  • A low-bandwidth connection between the source and destination systems
  • A local tape drive attached to the source system
  • A local tape drive attached to the destination system
Note: To prevent extended tape-to-storage system transfer time, you should ensure that the destination system disks be the same size and in the same RAID configuration as the source system disks.

You must follow this sequence of activities to set up this arrangement.

  1. On the source system, use the smtape backup command to copy all volume Snapshot copies, including the base Snapshot copy, to tape, and use the smtape continue command to continue the copy if more than one backup tape is necessary.
  2. Physically transport the backup tapes from the source system to the destination system.
  3. On the destination system, use the vol create and vol restrict commands to set up a SnapMirror target volume.
  4. Use the smtape restore command to copy the initial SnapMirror tape to the destination system and, if necessary, use the smtape continue command to continue the copy if it is stored on more than one backup tape.
  5. Either use the snapmirror update command to manually mirror an incremental update from the source to the destination system over the low-bandwidth connection, or edit the snapmirror.conf file to set up an incremental update schedule from the source to destination system.
  6. After completing manual or scheduled incremental update over a connection, you can use the snapmirror release command to eliminate the source-to-tape relationship and associated Snapshot copy.

For more information about smtape commands, see the Data ONTAP Data Protection Tape Backup and Recovery Guide for 7-Mode.