Prerequisites for smart manager for mainframe, Prerequisite os, Prerequisite hardware – HP XP Command View Advanced Edition Software User Manual

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For the tiers with a specified tiering policy level, the priority assigned to new pages is determined by
the combination of the values specified for the tiering policy level and new-page assignment tier.

For example, if

is specified as the tiering policy level and

MIDDLE

is specified as the new-page

assignment tier for a three-tier volume, the priority of three tiers is as follows: Tier 2 > Tier 3 > Tier 1.
The figure below shows how pages are assigned in this case. First, pages are assigned to Tier 2,
which is the highest priority. If Tier 2 becomes full, pages are assigned to Tier 3. If Tier 3 becomes
full, pages are assigned to Tier 1.

Figure 8 Overview of assigning new pages to tiers

The following table describes the values that can be used to specify the new-page assignment tier.

Table 2 Values that can be used to specify the new-page assignment tier

Description

Value

The new page is assigned from the higher tier of tiers set in the tiering policy.

HIGH

The new page is assigned from the middle tier of tiers set in the tiering policy.

MIDDLE

The new page is assigned from the lower tier of tiers set in the tiering policy.

LOW

For example, if newer data is accessed more frequently and older data is accessed less frequently,
you can specify

HIGH

for the new-page assignment tier because new pages are then assigned in

order starting from the upper tier.