Set Allocation

Overview

This function changes the allocation method for the existing Thin Provisioning Volumes (TPVs) and Flexible Tier Volumes (FTVs).

There are two allocation modes. The default value is "Thin".

Thin

Physical area is allocated to the target area of the volume when a write I/O is received.

This method virtualizes and allocates the storage capacity to reduce the physical capacity of the storage.
Thick

Physical area is allocated to the whole area of the volume when volumes are created.

This method is used for volumes such as those allocated for the system area to prevent system halts due to pool exhaustion during operations.

Caution

This function is available for "TPV" or "FTV" type volumes. Note that this function cannot be used for "TPV" type volumes that are used as Deduplication/Compression Volumes or Data Container Volumes.
If the allocation method is changed from "Thick" to "Thin", optimize the capacity. If a capacity optimization is not performed, the used capacity (the physical capacity that is allocated to volumes in the entire TPP) is not reduced. Refer to the [Optimize TPV/FTV Capacity] function for details.
This function cannot be used if the allocation method is changed from "Thin" to "Thick" when the free space in the TPP or FTRP has been insufficient.
This function cannot be used when the capacity releasing from the server is being performed.
This function cannot be used if one of the following conditions is true for the selected volume:
- A capacity optimization is being performed or a capacity optimization is being reserved when the allocation method is changed to "Thick"
- RAID migration is being performed
- TPV balancing is being performed
- FTRP balancing is being performed
- The selected volume belongs to a TPP with a "Broken" state
- The selected volume belongs to an FTRP with a "Broken" state
- The selected volume is a work volume that is created during a RAID migration

Note

The volume allocation method can be selected when creating a "TPV" or a "NAS Volume". The default value is "Thin". Refer to the [Create Volume] function for details.
For "TPV" type ODX Buffer volumes, the volume allocation method can be selected during volume creation. Refer to the [Create ODX Buffer Volume] function for details.
For "FTV" type volumes and for "FTV" type ODX Buffer volumes, the volume allocation method is specified during volume creation with CLI or ETERNUS SF Storage Cruiser.
The volume allocation method can also be changed when performing a RAID migration. Refer to the [Start RAID Migration] function for details.

Refer to "User Roles and Policies" for details on the policies and roles.

Item	Description	Setting values
Allocation	Select the allocation method. Caution Regardless of the allocation method (Thin or Thick) of the selected volume, "Thin" is selected when this function starts.	Thin Thick

Item

Description

Setting values

Allocation

Select the allocation method.

Caution

Regardless of the allocation method (Thin or Thick) of the selected volume, "Thin" is selected when this function starts.

Thin

Thick

Item	Description
No.	The volume number is displayed.
Name	The volume name is displayed.
Status	The volume status is displayed. Refer to "Volume Status" for details.
Type	The volume type is displayed. TPV FTV
Usage	The usage of the volume is displayed. Block The volumes that are used for the SAN. File The volumes that are used for the NAS. System The system volumes. Refer to "Usage Details" in the [Volume Detail] screen ([Basic] tab) for details. Veeam The volumes that are used for Veeam Storage Integration.
Capacity	The volume capacity is displayed.
Current Allocation	The current allocation method of the volume is displayed. Thin Thick

Select which volume to change the allocation method for (multiple selections can be made) and click [Set Allocation] in [Action].
Caution
- [Set Allocation] cannot be clicked under the following conditions:
  - Even if the selected volume type is "FTV", the usage is "System"
  - The NAS expanded system volumes are selected
  - The Deduplication/Compression Volumes are selected
  - The Data Container Volumes are selected
Select the allocation method, and click the [Set] button.

→ A confirmation screen appears.
Click the [OK] button.

→ Setting of the allocation method starts.
Click the [Done] button to return to the [Volume] screen.