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Thresholds

About pool utilization thresholds

Thin Provisioning monitors pool capacity using thresholds. A threshold is the proportion (%) of used

capacity of the pool to the total pool capacity. Each pool has its own pool threshold values.

• Warning Threshold: Set the value between 1% and 100%, in 1% increments. The default is

70%.

• Depletion Threshold: Set the value between 1% and 100%, in 1% increments. The default is

80%. The depletion threshold must be higher than the Warning threshold

Pool usage over either threshold will cause a warning to be issued in the form of SIMs (Service

Information Messages) to Remote Web Console and SNMP (Simple Network Management Protocol)

traps to the open-systems host. For more information on SNMP traps and the SNMP Manager, see

the HP P9000 SNMP Agent User Guide. See “Working with SIMs” (page 108) for more information

about SIMs.

The following figure illustrates a total pool capacity of 1 TB, Warning Threshold of 50%, and

Depletion Threshold of 80%. If the used capacity of the pool is larger than 50% (500 GB) of the

total pool capacity, a SIM is reported to Remote Web Console and an SNMP trap is reported to

the open-systems host. If the used capacity of the pool increases and exceeds the Depletion Threshold

(80%), a SIM and an SNMP trap are reported again.

Note that in this scenario, if the actual pool usage percentage is 50.1%, only 50% appears on

the Remote Web Console window because the capacity amount is truncated after the decimal

point. If the threshold is set to 50%, a SIM and an SNMP trap are reported even though the pool

usage percentage appearing on the screen does not indicate an exceeded threshold.

Pool subscription limit

The value of using subscription limit is to manage the maximum amount of over-provisioning that

is acceptable for a pool. By managing the pool subscription limit, you can control the potential

demand for storing data that might exceed the pool capacity.

The subscription limit is the ratio (%) of the total THP V-VOL capacity that has been configured to

the total capacity of the pool. When the subscription limit is set, you cannot configure another THP

V-VOL if the new THP V-VOL capacity would cause the subscription limit to be be exceeded.

For example, if the pool capacity is 100 GB and the subscription limit is 150%, you can configure

up to a total of 150 GB of capacity to the THP V-VOLs related to the pool.

The following figure depicts setting the subscription limit of pool capacity.

106 Configuring thin provisioning

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Hp XP P9500 Storage Bedienungsanleitung Seite 106