Hp XP20000XP24000 Disk Array Manuale Utente Scaricare il pdf (Pagina 23)

Figure 5 Managing Usage Rates and I/Os

By copying high-workload V-VOL data to low-workload pools using Business Copy, you can balance

the workload of pools.

Thresh

olds

XP Thin Provisioning monitors V-VOL and pool used capacity using thresholds. V-VOL capacity is

monitored using free space because V-VOL capacity is lower than pool capacity in general use. XP Thin

Provisioning monitors the pool used capacity in two phases. In the case of pool capacity, one of the

thresholds is a ﬁxed value, which cannot be changed. Another threshold is a variable value, which can

be changed using the Change Pool Information dialog box. When the values go over or under the

threshold, XP Thin Provisioning outputs a SIM warning the users and reports trapping to SNMP. The

following describes the meaning of each threshold.

• V-VO

Lthreshold

The V-VOL threshold is the ratio (%) of the free pool capacity to the free V-VOL capacity.

In the case that the free V-VOL capacity is 1 TB and the V-VOL threshold is 200%, when the free

pool

capacity is lower than 2 TB (1 TB X 200% / 100%), XP Thin Provisioning warns users by

outputting a SIM and reports trapping to SNMP.

A pool is shared by several V-VOLs, so it is preferable that the pool capacity is larger than or

equal to a single free V-VOL capacity. Therefore, you can set the V-VOL threshold between 5%

and300%. Thedefault valueis5%.

• Pool threshold

The

pool threshold is the ratio (%) of the used pool capacity to the total pool capacity. There are

two pool thresholds.

XP24000 Thin Provisioning Software User's Guide

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Hp XP20000XP24000 Disk Array Manuale Utente Pagina 23