To notify the host that the DP-VOL capacity has been increased, make sure host mode option 40 is enabled. Processing differs as follows, depending on the value of host mode option 40:

• When host mode option 40 is not enabled, the host will not be notified that the DP-VOL capacity has been increased. Therefore, the DP-VOL data has to be read again by the host after the capacity is increased.
• When host mode option 40 is enabled, the host is notified that the DP-VOL capacity has increased. If the operating system cannot recognize the value of capacity that was increased, the DP-VOL data has to be read again by your storage system.

The following requirements are important when increasing the DP-VOL capacity:

• The DP-VOL to be increased is not shared with a software product that does not allow increasing the volume capacity (see Increasing DP-VOL capacity).
• The DP-VOL is not undergoing LDEV formatting.
• The DP-VOL does not have data direct mapping enabled.
• The DP-VOL is not a deduplication system data volume.
• The capacity to be added to the DP-VOL must be specified within the range indicated below LDEV Capacity in the Expand V-VOLs window.
• The pool related to the DP-VOLs to be increased is in any one of the following statuses:
  • Normal
  • Exceeding the subscription limit threshold
  • In progress of pool capacity shrinking

After increasing DP-VOL capacity, refresh the display and confirm that the DP-VOL is increased. If the DP-VOL capacity is not increased, wait a while, refresh the display again, and confirm that the DP-VOL is increased. If you perform an operation without making sure that the DP-VOL is increased, operations from Device Manager - Storage Navigator may fail.

If one of the following operations is being performed, the DP-VOL capacity might not be increased:

• Volume Migration
• Configuration change of journal used by Universal Replicator
• Quick Restore by ShadowImage