HP StorageWorks XP Remote Web Console Software - Manual (Page 14)

SNMP trap are reported. If the used capacity of the pool increases and it exceeds threshold
2 (80%), a SIM and an SNMP trap are reported again.
Figure 5 Pool Capacity (When Pool Threshold 1 Is 50%)
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V-VOL thresholds:
The V-VOL threshold is the ratio (%) of the unassigned pool capacity to the unassigned V-VOL
capacity. The threshold can be specified from 5% to 300%.
If the following formula is true, a SIM and an SNMP trap are reported:
Unassigned V-VOL capacity x threshold > unassigned pool capacity
Example: When the V-VOL threshold is 300%
Figure 6 (page 14) shows the V-VOL capacity and the pool capacity (when the V-VOL threshold
is 300%). When a V-VOL capacity is 1 TB and the assigned capacity is 500 GB, the
unassigned capacity of the V-VOL is 500 GB. Therefore, if free space of the pool is smaller
than 1.5 TB (500 GB x 300%) of the unassigned capacity of the pool, a SIM and an SNMP
trap are reported.
Because a pool is sometimes used by multiple V-VOLs, the pool sometimes requires free space
larger than the unassigned capacity of the V-VOL. So, you can specify the V-VOL threshold
to a value more than 100%.
Figure 6 V-VOL Capacity and Pool Capacity (When V-VOL Threshold Is 300%)
Example 2: When the V-VOL threshold is 90%
Figure 7 (page 15) shows the V-VOL capacity and the pool capacity (when the V-VOL threshold
is 90%). If free space of the pool is smaller than 450 GB (500 GB x 90%) of the unassigned
capacity of the pool, a SIM and an SNMP trap are reported.
14 About XP Thin Provisioning Operations