Expand Volume

This function concatenates a new volume to the selected volume by using the LUN Concatenation function to expand the volume capacity that can be used from the server.

Volume expansion provides the following features:

• Volume capacity can be expanded by using the free space in an existing RAID group.

• Free space that is 1 GB or more can be concatenated.

• A volume with a maximum capacity of 128 TB can be created. (The maximum capacity of ODX Buffer volume is 1 TB.)

• Concatenation can be performed among multiple RAID groups.

• Any RAID level can be applied for a concatenation source volume and a concatenation destination volume. Concatenation can be performed regardless of the RAID level for the concatenation source volume and the concatenation destination volume.

• Data can be accessed from the host in the same way regardless of the concatenation status (before, during, or after concatenation).

• When the number of volumes in a concatenated volume is 15 or less, volumes can be added to the existing concatenated volume.

Requirements for concatenating a volume

• The volume type is "Standard"

• The volume capacity is 1 GB or larger

• When the concatenation source volume is a concatenated volume, the volume must satisfy the following requirements:

  • The number of volumes in the concatenated volume must be 15 or less

  • The capacity of the concatenated volume must be less than 128 TB

    (If the concatenated volume is configured with the ODX Buffer volume, the volume must be less than 1 TB)

• The volume status is not "Broken", "Data Lost", "Not Ready", or "Readying"

• RAID migration is not being performed (the target volume is not used as a migration source or a migration destination)

• There are no Advanced Copy sessions (local or remote) for which the copy range is "Totally" (*1)

• LDE is not being performed for the RAID group to which the target volume belongs

• Encryption is not being performed for the target volume

• A Storage Migration path is not created in the target volume

• "Cache Page Capacity" is not specified (*2)

• Not used for the Storage Cluster function

• Data protection by "T10-DIF (Data Integrity Field)" is not enabled

• The volume is not an External Volume

  *1

  :

  "Totally" is specified for the copy range in the following conditions: When performing a LUN to LUN copy session with the ETERNUS SF AdvancedCopy Manager Copy Control Module (CCM) When performing a copy session with ETERNUS SF AdvancedCopy Manager Adapter for VMware Site Recovery Manager When performing a copy session with ETERNUS VSS Hardware Provider When performing a SnapOPC+ session that is specified with Web GUI or CLI

  *2

  :

  A "-" (hyphen) is specified for "Cache Page Capacity" by using the [Modify Cache Parameters] function. Note that "-" (hyphen) is the default value.

Requirements to obtain free space from RAID groups

• The volume status is not "Broken"

• The RAID group is not blocked

• LDE is not being performed in the target RAID group

• The RAID group is not an External RAID Group

• The RAID group must satisfy the following requirements:

  • The RAID group must contain Standard type volumes, WSVs, SDVs, or SDPVs. If this is not the case, the RAID group must not contain any volumes.

  • The RAID group must not belong to TPPs

  • The RAID group must not belong to FTRPs

  • RAID groups that are not registered as REC Disk Buffers

  • RAID groups that are not registered as Extreme Cache Pools

• The number of volumes registered in the target RAID group is less than 128

• The free space for the RAID group is 1 GB or larger

• The drive type for configuring the RAID group where the concatenation source volume belongs and the drive type for configuring the concatenation destination RAID group must be the following combination of drive types

  		Concatenation destination drive type
  		Online	Nearline	SSD	Online SED	Nearline SED	SSD SED
  Concatenation source drive type	Online	OK	OK (but not recommended)	NG	NG	NG	NG
  	Nearline	OK (but not recommended)	OK	NG	NG	NG	NG
  	SSD	NG	NG	OK	NG	NG	NG
  	Online SED	NG	NG	NG	OK	OK (but not recommended)	NG
  	Nearline SED	NG	NG	NG	OK (but not recommended)	OK	NG
  	SSD SED	NG	NG	NG	NG	NG	OK

  OK: Concatenation is available    OK (but not recommended): Concatenation is available, but not a recommended configuration    NG: Concatenation is not available

Recommended conditions to obtain free space from RAID groups

• Set the same values for the following items to RAID groups where the concatenation source volume belongs and to RAID groups that will be concatenated.

  • RAID level

  • Drive speed

  • Drive type (Online/Nearline)

  • Drive type (Online SED/Nearline SED)

  • SSD type (SSD-H/SSD-M/SSD-L/SSD-H SED/SSD-M SED/SSD-L SED)

  • Key group setting status (SED (Enabled Key Group)/SED (Disabled Key Group))

  The speed and SSD type of the drive that configures a RAID group can be checked in the [RAID Group Detail] screen ([Drive] tab).

Availability of Executions in the Default Role

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

In this screen, add capacity to the existing volume.

Setting Volume

Manual Setting

Add Capacity

The settings that are specified in the [Add Capacity] screen are displayed.

[Add Capacity] screen

In this screen, select the RAID group to obtain free space from and specify the capacity that is to be added.

Capacity

RAID Group List

Function Button

1. Select the volume to be expanded and click [Expand Volume] in [Action].

   Caution

   • [Expand Volume] cannot be clicked when External Volumes (or volumes whose "Usage" is "Migration") are selected.

2. Click the [Add] button.

   → The [Add Capacity] screen is displayed.

3. Select the RAID group to obtain the free space from, specify the capacity to be concatenated, and click the [OK] button.

   → Returns to the [Expand Volume] screen.

4. Repeat Step 2 and Step 3 to select RAID groups and specify the capacity. After completing these settings, click the [Expand] button.

   → A confirmation screen appears.

5. Click the [OK] button.

   → Expansion of a volume starts.

6. Click the [Done] button to return to the [Volume] screen.