Expansion order policy when TrueCopy pair shares the same volumes with other software

TrueCopy® User Guide

Version
9.8.7
Audience
anonymous
Part Number
MK-98RD9022-18

You can expand the capacity of DP-VOLs used in a TC pair and each software pair when a TC pair shares the same volumes with global-active device (GAD), Universal Replicator (UR), ShadowImage (SI), and Thin Image (HTI).

When a TC pair shares the same volumes with other software, the order in which you expand the DP-VOL capacity consists of the following two expansion orders:

  • Expansion order in a point to point configuration of the TC pair
  • Expansion order in a point to point configuration of each software product


  • When a remote replication (TC/UR/GAD) is included, first expand the S-VOL capacity on the end of the remote replication, and then expand the P-VOL capacity. For more information about the specific expansion procedure, see Expanding DP-VOL capacity when TrueCopy pair is used with Universal Replicator.
  • When a remote replication (TC/UR/GAD) shares the same volumes with a local replication (SI/HTI), first expand the capacity of the S-VOL group in the remote replication. The S-VOL group consists of the S-VOL in the remote replication and all volumes in the local replication with which the S-VOL shares the same volume. After expanding the capacity of the S-VOL group in the remote replication, expand the capacity of the P-VOL group in the remote replication. The P-VOL group consists of the P-VOL in the remote replication and all volumes in the local replication with which the P-VOL shares the same volume.

    The expansion order in each group follows the expansion order in the local replication. For more information about the specific expansion procedures, see Expanding DP-VOL capacity when TrueCopy pair is used with ShadowImage and Expanding DP-VOL capacity when TrueCopy pair is used with Thin Image .

  • In the local replication (SI/HTI), expand the capacity in the order from the highest layer to the lowest. The expansion order is not specified for the volumes in the same layer.