DP-VOL with data direct mapping attribute

Procedure

1. In the Add External Volumes window, add a volume of an external storage system to an external volume group.

2. In the Create LDEVs window, create an external volume for which the data direct mapping attribute enabled.

3. 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.

4. In the Create LDEVs window, create a DP-VOL with the data direct mapping attribute enabled.

5. 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: Dynamic Provisioning pools Dynamic Tiering pools (including active flash)	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.

Parent Topic

• Dynamic Provisioning

  Thin provisioning is an approach to managing storage that maximizes physical storage capacity. Instead of reserving a fixed amount of storage for a volume, capacity from the available physical pool is assigned when data is actually written to the storage media.