Assign REC Disk Buffer

This function assigns an REC Disk Buffer to an REC Buffer. This function also deletes the assignment of the REC Disk Buffers.

Requirements for REC Buffers to Assign REC Disk Buffers

• The usage of the REC Buffer must be "Send"

• The number of REC Disk Buffers that are to be assigned to a single REC Buffer must be one of the following numbers.

  • For the ETERNUS DX100 S5/DX200 S5: One or two (but less than or equal to the number of CMs that are installed)

  • For the ETERNUS DX500 S5/DX600 S5: One or two

  • For the ETERNUS DX900 S5: One, two, or four (but less than or equal to the number of CMs that are installed)

  • For the ETERNUS DX8900 S4: One, two, four, or six (but less than or equal to the number of CMs that are installed)

  • For the ETERNUS AF150 S3/AF250 S3: One or two

  • For the ETERNUS AF650 S3: One or two

• Requirements to assign multiple REC Disk Buffers to a single REC Buffer

  • The drive type (Online/Nearline/SSD/Online SED/Nearline SED/SSD SED) must be the same (*1)

  • The assigned REC Disk Buffers have the same number of drives (two, four, or eight)

  • The assigned REC Disk Buffers have the same encryption status ("CM", "-", or "SED")

• Recommended conditions for assigning multiple REC Disk Buffers to a single REC Buffer

  • The assigned REC Disk Buffers have the same Stripe Depth (*2)

  • The assigned REC Disk Buffers have the same capacity (*3)

  • The SSD type (SSD-H/SSD-M/SSD-L/SSD-H SED/SSD-M SED/SSD-L SED) must be the same

  *1	:	Only assigning either "Online" or "Nearline" REC Disk Buffers is recommended. Also, only assigning either an "Online SED" or a "Nearline SED" REC Disk Buffers is recommended. This is because the available capacity and the access performance may be reduced when these REC Disk Buffers are assigned in the same REC Buffer.
  *2	:	If the Stripe Depth is different for the used REC Disk Buffers, access performance of the REC Disk Buffer may be affected.
  *3	:	When using REC Disk Buffers of different capacities, the smallest becomes the standard, and all other REC Disk Buffers are regarded as having the same capacity as the smallest REC Disk Buffer. In this case, the remaining REC Disk Buffer space will NOT be used.

Availability of Executions in the Default Role

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

The selected REC Buffer and the REC Disk Buffers, which will be/are assigned to the REC Buffer, are displayed.

REC Buffer Information

Assign REC Disk Buffer

Function Button

In this screen, select the REC Disk Buffer that is to be assigned to the REC Buffer.

[Select REC Disk Buffer] Screen

Select REC Disk Buffer

For other items that are not described in this section, refer to "Assign REC Disk Buffer".

Assigning an additional REC Disk Buffer

In this screen, assign an additional REC Disk Buffer.

1. Select the REC Buffer, to which the REC Disk Buffer is to be assigned, and click [Assign REC Disk Buffer] in [Action].

2. Click the [Add] button.

   → The [Select REC Disk Buffer] screen appears.

3. Select the checkbox for the additional REC Disk Buffer (multiple selections can be made) that is to be assigned, and click the [OK] button.

   → The selected REC Disk Buffer is added.

   Caution

   • When assigning multiple REC Disk Buffers to an REC Buffer, select ones with the same capacity.

   • An error screen appears in the following conditions:

     • No REC Disk Buffers, which satisfy the assignment requirements, are registered to the storage system

     • The number of REC Disk Buffers, which are assigned to an REC Buffer, exceeds the maximum number which the storage system model supports

     • The selected REC Disk Buffer does not satisfy the assignment requirements

   Note

   • To delete the assignment of the REC Disk Buffer, click the [Delete] button for the target REC Disk Buffer (RAID group).

4. When the REC Disk Buffer assignment has been completed, click the [Modify] button.

   → A confirmation screen appears.

5. Click the [OK] button.

   → The REC Disk Buffer assignment starts.

6. Click the [Done] button to return to the [REC Buffer] screen.

Deleting an REC Disk Buffer assignment

In this screen, delete the assignment of the REC Disk Buffers from the REC Buffer.

1. Select the REC Buffer to delete the assignment of the REC Disk Buffer, and click [Assign REC Disk Buffer] in [Action].

2. To delete the assignment of the REC Disk Buffer, click the [Delete] button for the target REC Disk Buffer (RAID group).

   → The selected REC Disk Buffer is deleted from the list.

3. Click the [Modify] button.

   → A confirmation screen appears.

4. Click the [OK] button.

   → Deletion of an REC Disk Buffer starts.

5. Click the [Done] button to return to the [REC Buffer] screen.