Delta resync configuration

With the delta resync configuration, you bring the S-VOL to a consistent state more quickly after failure because only missing differential data must be copied.

You create the delta resync configuration by adding a second UR pair to the 3DC multi-target configuration, using the TC S-VOL and the UR S-VOL, as illustrated in the following figure. The delta resync operation is performed when the primary site fails.

Parent Topic

• Configurations with TrueCopy

Child Topics

• Additional task for the 3DC multi-target configuration using delta resync

  To use delta resync, you need to perform an additional task after setting up 3DC multi-target configuration.

• Creating the delta resync pair
• Setting up remote command devices for use with RAID Manager
• Mapping remote command devices for delta resync operations
• Assigning mirrors to remote command devices for delta resync operations
• Releasing a remote command device for delta resync operations assigned to a mirror
• Relationship between deleted associated pairs and assigned remote command devices

  You can change a 3DC configuration that uses the delta resync function to a configuration that does not use it by deleting pairs. At this time, along with the deleted pairs, associated pairs are also deleted automatically, and the assignment of remote command devices is released automatically.

• Performing the delta resync operation