Pair operations workflow

You must have Storage Administrator (Remote Copy) role to perform TrueCopy operations.

Basic TrueCopy operations consist of the following operations.

• Check prerequisites for each procedure.

• Always check pair status. Each TrueCopy operation requires the pair to be in a specific status.

• Create a pair, in which the S-VOL becomes a duplicate of the P-VOL.

• Split a pair, which separates the P-VOL and S-VOL and allows read/write access to the S-VOL if desired.

• Resynchronize a pair, in which the S-VOL again mirrors the on-going, current data in the P-VOL.

• Delete a pair.

• To perform pair operations or check the pair status, LU paths must be established. If you intend to perform storage or replication management operations, make sure that pairs are deleted before removing LU path definitions.

• Pair operations cannot be performed when changing the microcode or firmware, nor if microcode or firmware changes are cancelled. If you start a microcode or firmware change, make sure it is complete before performing pair operations.

• Pair operations cannot be performed when changing the firmware, nor if firmware changes are cancelled. If you start a firmware change, make sure it is complete before performing pair operations.

• When any of the following conditions occur during TC pair duplication, sometimes the TC pair splits to prioritize refresh I/O rather than TC pair duplication.

- The MP blade processor operation rate which the P-VOL belongs is 70% or higher in the primary system.

- Refresh I/O inflow for the P-VOL is large in the primary system.

- MP blade write-pending which S-VOL belongs is 65% or higher in the secondary system.

When creating or resynchronizing TC pairs, be aware of the load of the storage systems at each site.