Dynamic Provisioning for Mainframe requires the use of DP-VOLs, which are virtual volumes with no physical memory space. In Dynamic Provisioning for Mainframe, multiple DP-VOLs can be created.
Requirements for increasing DP-VOL capacity
You can increase the capacity of a DP-VOL up to 1,182,006 cylinders (for 3390-A). You can increase the capacity of a DP-VOL up to 1,182,006 cylinders for 3390-A.
These requirements are important when increasing the DP-VOL capacity:
- The emulation type is 3390-A.
- The DP-VOL to be increased is not shared with a software product that does not allow increasing the volume capacity.
- The DP-VOL is not undergoing LDEV formatting.
- The pool related to the DP-VOLs to be increased is in any one of these statuses:
- Normal
- Exceeding the subscription limit threshold
- In progress of pool capacity shrinking
- When increasing multiple virtual volumes in one operation, expand to the following volumes:
- Virtual volumes of the same type (TSE-VOLs, ESE-VOLs, DP-VOLs with no attributes)
- Combination of ESE-VOLs and DP-VOLs with no attributes
- You cannot expand both the TSE-VOL and the DP-VOL in one operation. You can only expand volumes whose types are same in a single operation.
For more information about the procedure for increasing the capacity of a DP-VOL used in the TrueCopy for Mainframe pair, global-active device pair, Universal Replicator for Mainframe pair, or ShadowImage for Mainframe pair, see the User Guide for each software product.
When increasing DP-VOL capacity, do not perform the following operations.
When you perform these operations, do not increase DP-VOL capacity.
- Operations using Virtual LVI
- Creating DP-VOLs
- Restoring pools
- Deleting DP-VOLs
- Maintenance of your storage system
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 one of these operations is being performed, the DP-VOL capacity might not be increased:
- Volume Migration
- Configuration change of journal used by Universal Replicator for Mainframe
- Quick Restore by ShadowImage for Mainframe
If you place the DP-VOL online with an operating system that does not support DVE (Dynamic Volume Expansion), for instance operating systems whose versions are z/OS 1.9 and z/VM 5.4, the DP-VOL capacity cannot be increased. If you add capacity to the DP-VOL, take the DP-VOL offline when the operating system that does not support DVE, and then increase the capacity of the DP-VOL. DVE is a function for increasing volume capacity while the volume is online to a host system.
After the DP-VOL capacity is increased, the host issues reserved I/Os to the DP-VOL to update the VTOC area. In this case, I/Os issued from other hosts to the DP-VOL are waiting for the reservation to be released. The reply from the DP-VOL might be delayed, or the I/Os from other hosts might time out. If the system operation could be inhibited by an interruption of a delayed reply or a timeout, do not increase the capacity of the DP-VOL.