HP P9000 Provisioning for Mainframe Systems User Guide (AV400-96369, October 2011)

• 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 unless the pool related to the target THP V-VOL is
in any one of the following statuses:
◦ Normal
◦ Exceeding subscription limit threshold
◦ In progress of pool capacity shrinking
CAUTION: When increasing THP V-VOL capacity, do not perform the following operations. Also,
when performing 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 can 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 with 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 that is presented by International Business Machine Corporation.
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 is assumed to interrupt by a delayed reply or a timeout,
do not increase the capacity of the THP V-VOL.
Thin provisioning requirements 49