HP XP P9500 Storage - Manual (Page 58)

Requirements for increasing THP V-VOL capacity
You can increase THP V-VOL capacity up to 262,668 cylinders.
The following requirements are important when increasing the THP V-VOL capacity:
•
The emulation type is 3390-A.
•
The THP V-VOL to be increased is not shared with a P9500 product that does not allow
increasing the THP V-VOL (See
“Increasing THP V-VOL capacity” (page 129) ).
•
The THP V-VOL is not undergoing LDEV formatting.
•
The capacity to be added to the THP V-VOL must be specified within the range indicated
below LDEV Capacity in the Expand V-VOLs window.
•
You cannot add capacity to the THP V-VOL while the pool related to the target THP V-VOL is
in any one of the following statuses:
◦ Exceeding the subscription limit threshold
◦ In progress of pool capacity shrinking
•
You cannot expand both the TSE-VOL and the THP V-VOL in one operation. Expand the same
type volumes in a single operation.
•
You cannot expand both the Compatible FlashCopy SE volume and Thin Provisioning Z volume
in one operation. In this case, you must expand volumes whose types are same.
CAUTION: When increasing THP V-VOL capacity, do not perform the following operations.
When you perform these operations, do not increase THP V-VOL capacity.
•
Operations using Virtual LVI
•
Operations using Cache Residency
•
Creating THP V-VOLs
•
Restoring pools
•
Deleting THP V-VOLs
•
Maintenance of your storage system
After increasing THP V-VOL capacity, click Refresh in Remote Web Console, and then confirm that
the THP V-VOL is increased. If the THP V-VOL capacity is not increased, wait a while, click Refresh
again, and confirm that the THP V-VOL is increased. If you perform a Remote Web Console
operation without making sure that the THP V-VOL is increased, operations from Remote Web
Console may fail.
If you place the THP V-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 THP V-VOL capacity cannot be increased. If you add capacity to the THP V-VOL, take the THP
V-VOL offline when the operating system that does not support DVE, and then increase the capacity
of the THP V-VOL. DVE is a function for increasing volume capacity while the volume is online to
a host system.
After the THP V-VOL capacity is increased, the host issues reserved I/Os to the THP V-VOL to update
the VTOC area. In this case, I/Os issued from other hosts to the THP V-VOL are waiting for the
reservation to be released. The reply from the THP V-VOL may be delayed, or the I/Os from other
hosts may time out. If the system operation may be inhibited by an interruption of a delayed reply
or a timeout, do not increase the capacity of the THP V-VOL.
58 Configuring thin provisioning