Custom policies cannot be renamed.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 Setting tiering policy on a DP-VOL.
A custom policy can be set for a DP-VOL when it is created and changed, if necessary, after creation.
Custom policies cannot be renamed.
Dynamic Tiering performs relocation while calculating page allocation based on the tiering policy setting of all DP-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 DP-VOLs that have the same tiering policy set for a pool. See Tiering policy examples.
Tier1 and Tier3 parameter settings can also limit the capacity for all volumes in a configuration that contain multiple DP-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.