To prevent the two volumes from being swapped, the P-VOL and S-VOLs must be assigned to the same cache partition (CLPR).Reverse resynchronization
You can use one of the following methods to restore pairs, including the requirements and restrictions:
Reverse Copy (Secondary > Primary). A full restoration from the S-VOL to the P-VOL. The differential data is updated to the P-VOL.
During a Reverse Copy you can delete or suspend the pairs, but you cannot create, split, or resynchronize pairs that share the same P-VOL. The P-VOL is inaccessible to hosts.
If you are sharing a TC or UR volume with an SI volume, you cannot create a TC or UR pair with the shared volume.
You cannot use Reverse Copy with the following pairs:
An SI L2 pair.
If you are sharing the P-VOL with an FCv2/FCSE volume.
Quick Restore (Secondary > Primary). A partial restoration that does not copy the data but does the following:
Swaps the P-VOL and S-VOL including their RAID levels, HDD types, and Cache Residency Manager settings.
Pairs the volumes ("PAIR" status).
Exchanges the P-VOL and S-VOL encryption statuses if an SI pair consists of encrypted volumes and a non-encrypted volume.
To prevent the two volumes from being swapped, the P-VOL and S-VOLs must be assigned to the same cache partition (CLPR).
During a Quick Restore, the P-VOL and S-VOL are inaccessible. After a Quick Restore, the P-VOL is accessible.
Best Practice: If you have a small amount of differential data, use Reverse Copy instead of Quick Restore, since Reverse Copy completes faster.
If you use volumes for which you set Data Retention Utility access attributes, Quick Restore does not exchange the P-VOL and S-VOL access attributes.
HDvM - SN can show outdated information after a Quick Restore. To show the latest information, click Refresh View.
To minimize the time it takes to Quick Restore an SI pair, do not perform LDEV maintenance while the Quick Restore is processing.
You can delete or suspend the pair while you are restoring the pair using Quick Restore but you cannot do the following:
Create, split, or resynchronize pairs that share the same P-VOL.
Create a TC or UR pair with a volume shared by SI.
You cannot Quick Restore the following pairs:
An SI L2 pair
A pair volume for which you are formatting either internal volume using Quick Format.
For more information about formatting volumes using Quick Format, see the Hitachi Virtual Storage Platform G200, G400, G600 Provisioning Guide.
A pair in which one volume is a DP-VOL, though not both.
An SI S-VOL you are sharing with an HTI volume.