HP XP P9500 Storage - Manual (Page 86)

Example of adding a tier
If no tier appropriate to the added pool-VOLs is in the pool, the tier is added to the appropriate
position according to its performance. The following figure illustrates adding a tier.
Example of deleting a tier
If a tier runs out of the pool-VOLs when you delete them, the tier is deleted from the pool. The
following figure illustrates deleting a tier.
For more information about tiering policy and groups, see “Tiering policy levels” (page 86) .
Tiering policy levels
Note Number of tiers in a pool Level of tiering policy
3 tiers 2 tiers 1 tier
Default value. Data is stored in any of the tiers. All tiers All tiers All tiers All
Data is always stored in the highest tier. Tier 1 Tier 1 Tier 1* Level 1
Level 2, 3, and 4 settings are the same as setting All. All tiers All tiers All tiers Level 2
Levels 2, 3, and 4 settings will change in future
microcode release.
All tiers All tiers All tiers Level 3
All tiers All tiers All tiers Level 4
Data is always stored in the lowest tier. Tier 3 Tier 2 Tier 1 Level 5
Viewing the tiering policy in the performance graph
You can view the frequency distribution graph of the pool by selecting either the level of the tiering
policy or the entire pool on the performance graph in the View Tier Properties window.
The following table shows how tiering policy is shown in the performance graph. How the graph
appears depends on the number of tiers set in a pool and tiering policy level selected when viewing
the performance graph.
Number of tiers in pool Tiering policy
selected with
performance graph
3 tiers 2 tiers 1 tier
In the performance graph, you
can display a frequency In the performance graph,
you can display a frequency In the performance graph,
you can display a frequency All
distribution of a THP V-VOL
assigned to level ALL, 2, 3, or 4. distribution of a THP V-VOL
assigned to level ALL, 2, 3, or
4. distribution of a THP V-VOL
assigned to any tiering policy.
In the performance graph, you
can display the frequency In the performance graph,
you can display the frequency You cannot select these
settings while displaying the Level 1
distribution of a THP V-VOL
assigned to level 1. distribution of a THP V-VOL
assigned to level 1. performance graph. Use a
setting of All instead.
86 Configuring thin provisioning