Sharing volumes with Universal Replicator

You can share SI P-VOLs with UR P-VOLs and S-VOLs.

• You can use SI cascaded pairs as UR pairs. In cascaded pairs, UR does not distinguish between node and leaf volumes. Both are considered as S-VOLs.

  For more information about cascaded pairs, see Cascaded pairs.

• (VSP 5000 series) When you share the SI P-VOL with a UR S-VOL, if you split the SI pair during write I/Os to the UR P-VOL, only part of write I/Os might be written to the SI S-VOL. To keep data consistency in the SI S-VOL, use consistency group pair-split to split the SI pair.
• If you plan to Quick Restore the SI pair, you must first suspend the UR pair.

  For more information about Quick Restore, see Reverse resynchronization.

• You can perform a CTG pair-split on SI pairs that share volumes with UR S-VOLs.

  For more information about using CTG pair-split on pairs with shared volumes, see Using consistency group pair-split with shared volumes.

For more information about sharing SI and UR volumes, see the related appendix in the Hitachi Universal Replicator User Guide.

The following table describes ShadowImage operations when SI P-VOLs are shared with UR P-VOLs or S-VOLs.

The following table describes ShadowImage operations when SI S-VOLs are shared with UR P-VOLs.