Multi-tier pool
With Dynamic Tiering, you can enable the Multi-Tier pool option for an existing pool. The default is to allow tier relocation for each DP-VOL. Only the DP-VOLs for which tier relocation is enabled are subject to calculation of the tier range value, and tier relocation will be performed on them. If tier relocation is disabled for all DP-VOLs in a pool, tier relocation is not performed.
The following figure illustrates the relationship between multi-tier pool and tier relocation.
Example of adding a tier
If the added pool-VOL is a different media type, then a new tier is created in the pool. The tier is added to the appropriate position according to its performance. The following figure illustrates the process of adding a tier.
Example of deleting a tier
If a tier no longer has any pool-VOLs when you delete them, the tier is deleted from the pool. The following figure illustrates deleting a tier.
