HP StorageWorks XP Remote Web Console Software - Manual (Page 69)

NOTE:
•
If system option mode 726 is enabled (not the default setting), you can set only one V-VOL in
one V-VOL group. You can increase the size of the V-VOL without first migrating the V-VOL,
but you cannot use the V-VOL as a custom-sized volume (CVS).
•
If system option mode 726 is disabled (the default setting), you can set more than one V-VOL
in one V-VOL group.
•
The V-VOL to be increased is not shared with an XP product that cannot increase the V-VOL
(see the
“Using XP Thin Provisioning with Other Products” (page 18) ).
•
The V-VOL is not undergoing the LDEV format operation.
•
The capacity to be added to the V-VOL is smaller than the capacity displayed below the
remaining label in the V-VOL window.
•
If you increase the V-VOL capacity, the ratio of the free space capacity of the pool to the free
space capacity of the V-VOL is equal to or more than the V-VOL threshold.
For details about the relation between increasing V-VOL capacity and the V-VOL threshold,
see
“Relation Between Increasing V-VOL Capacity and V-VOL Threshold” (page 70) .
Examples 1 and 2 illustrate whether the capacity of a V-VOL can be increased if the V-VOL
threshold is 50 percent.
◦ In Example 1, the ratio of the free space capacity of the pool to the free space capacity
of the V-VOL is 200 percent before the capacity increase and about 56% after the capacity
increase. These percentages exceed the threshold (50 percent). Therefore, the capacity
of the V-VOL can be increased.
◦ In Example 2, the ratio of the free space capacity of the pool to the free space capacity
of the V-VOL is about 133 percent before the capacity increase and 40% after the capacity
increase. Since the ratio goes below threshold (50 percent) after the capacity increase,
the capacity of the V-VOL cannot be increased.
◦ In Example 3, the ratio of the free space capacity of the pool to the free space capacity
of the V-VOL is 200 percent, which is lower than the threshold (250 percent). Therefore,
the capacity of the V-VOL cannot be increased.
For details about how to calculate the V-VOL threshold, see “V-VOL Requirements” (page 27) .
Managing V-VOLs and V-VOL Groups 69