In the Add LUN Paths window, configure a LU path to the DP-VOL with the data direct mapping attribute enabled. 
DP-VOL with data direct mapping attribute
By using a DP-VOL for which the data direct mapping attribute is enabled, you can create a mapping of an external volume larger than 4 TB without having to change its capacity as a DP-VOL of the local storage system.
A DP-VOL with the data direct mapping attribute enabled is associated with the following pool-VOLs: an external volume for which the data direct mapping attribute is enabled and a pool-VOL with System Area.
To use DP-VOLs with the data direct mapping attribute enabled, you must enable the data direct mapping attribute for pool-VOLs, pools, and DP-VOLs.
Procedure
In the Add External Volumes window, add a volume of an external storage system to an external volume group.
In the Create LDEVs window, create an external volume for which the data direct mapping attribute enabled.
In the Create Pools window, create a Dynamic Provisioning pool for which the data direct mapping attribute is enabled. Specify the following volumes as pool-VOLs:
The external volume with the data direct mapping attribute enabled.
One or more normal volumes or external volumes.
In the Create LDEVs window, create a DP-VOL with the data direct mapping attribute enabled.
In the Add LUN Paths window, configure a LU path to the DP-VOL with the data direct mapping attribute enabled.
The following table shows what kind of external volumes can be added as pool-VOLs:
|
Operation |
Data direct mapping attribute of external volumes |
|
|
Disabled |
Enabled |
|
|
Add volumes to a pool with the data direct mapping attribute enabled |
The volumes can be added. |
The volumes can be added. |
|
Add volumes to the following pools:
|
The volumes can be added. |
The volumes cannot be added. |
The following table shows what kind of operations can be performed when the data direct mapping attribute of a Dynamic Provisioning pool is enabled or disabled:
|
Operation |
Data direct mapping attribute of the pool |
Remark |
|
|
Disabled |
Enabled |
||
|
Add an LDEV for which the data direct mapping attribute is disabled to the pool |
The operation can be performed. |
The operation can be performed. |
None |
|
Add an external volume for which the data direct mapping attribute is enabled to the pool |
The operation cannot be performed. |
The operation can be performed. |
None |
|
Set the depletion threshold and the warning threshold |
The operation can be performed. |
The operation cannot be performed. |
None |
|
Set subscription |
The operation can be performed. |
The operation can be performed. |
None |
|
Protect V-VOLs when I/O fails to Blocked Pool VOL |
The operation can be performed. |
The operation can be performed. |
None |
|
Protect V-VOLs when I/O fails to Full Pool |
The operation can be performed. |
The operation can be performed. |
None |
|
Performing rebalancing |
The operation can be performed. |
The operation can be performed. |
None |
|
Define the used capacity of the pool |
The sum of the reserved pages capacity and the mapped capacity |
The sum of the reserved pages capacity and the mapped capacity |
None |
|
Define the licensed capacity |
The sum of the pool-VOLs |
The sum of pool-VOLs for which the data direct mapping attribute is disabled. However, the license capacity does not include the capacity of pool-VOLs for which the data direct mapping attribute is enabled. |
None |
|
Expand pool |
The operation can be performed. |
The operation can be performed. However, the capacity of pool-VOLs with System Area must be reserved in advance. For details on how to estimate the capacity of pool-VOLs with System Area. |
None |
|
Shrink pool |
The operation can be performed. |
The operation can be performed. However, if a pool-VOL for which the data direct mapping attribute is enabled is associated with a DP-VOL, you cannot shrink the pool. |
None |
|
Delete pool |
The operation can be performed. |
The operation can be performed. |
You can delete a pool only if there is no DP-VOL that is associated with the pool |
|
Create DP-VOL |
You can only create DP-VOLs for which the data direct mapping attribute is disabled. |
You can only create DP-VOLs for which the data direct mapping attribute is enabled. |
None |
|
Implement a change to Dynamic Tiering (including active flash pool) |
The operation can be performed. |
The operation can be performed. |
None |
The following table shows what kind of operations can be performed when the data direct mapping attribute of a DP-VOL is enabled or disabled:
|
Operation |
Data direct mapping attribute of the DP-VOL |
|
|
Disabled |
Enabled |
|
|
Configure LU paths |
The operation can be performed. |
The operation can be performed. |
|
Format LDEVs |
The operation can be performed. |
The operation can be performed. |
|
Delete LDEVs |
The operation can be performed. |
The operation can be performed. |
|
Expand V-VOLs |
The operation can be performed. |
The operation cannot be performed. |
|
Reclaim zero pages |
The operation can be performed. |
The operation cannot be performed. |
|
Execute the V-VOL full allocation function |
The operation can be performed. |
The operation cannot be performed. |
|
Protect V-VOLs when I/O fails to Blocked Pool VOL |
The operation can be performed. |
The operation can be performed. |
|
Protect V-VOLs when I/O fails to Full Pool |
The operation can be performed. |
The operation can be performed. |
|
Apply to LDEVs of SLU attribution |
The operation can be performed. |
The operation cannot be performed. |