Tiering Policy Expansion; Tiering Policy Examples - HP XP7 User Manual

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Tiering policy expansion

In the current release, the tiering policy concept has been expanded to provide new options:
Custom policies. You can define up to 26 new policies (Level6(6) - Level31(31)) in addition
to the existing six (All(0), Level1(1), Level2(2), Level3(3), Level4(4), and Level5(5)). See
tiering policy on a THP V-VOL" (page
A custom policy can be set for a THP V-VOL when it is created and changed, if necessary,
after creation.
NOTE:
Smart Tiers Z performs relocation while calculating page allocation based on the tiering policy
setting of all THP V-VOLs that have the same tiering policy in each pool.
Max(%) and Min(%) parameters. When a tiering policy is created, 4 types of parameters can
be set: Tier1 Max and Tier 1 Min, Tier 3 Max and Tier 3 Min. Each parameter setting is a
ratio that corresponds to the total capacity of the allocated area of THP V-VOLs that have the
same tiering policy set for a pool. See
Tier1 and Tier3 parameter settings can also limit the capacity for all volumes in a configuration
that contain multiple THP V-VOLs that have the same intended use. These settings can prevent
conditions such as the following from occurring.
Excess allocation of SSD capacity for unimportant applications.
Degradation in average response time for high performance operations.

Tiering policy examples

The following figure shows the parameter settings Tier1 Max=40%, Tier1 Min=20%, Tier3
Max=40%, and Tier3 Min=20% for a THP V-VOL with a Level6(6) setting when the initial mapped
capacity of is 100GB.
The following figure shows an example of data allocation when the default tiering policy level
All(0) is specified. Pages in the THP V-VOL are relocated to any tier.
Custom policies cannot be renamed.
94).
"Tiering policy examples" (page
"Setting
93).
Smart Tiers Z
93

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