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.
Note
- To perform pair operations or check the pair status in HDvM - SN, LU paths must be established for the target volume.
- 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.
- 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/MP unit 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/MP unit 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.