Set ALUA

Overview

This function sets Asymmetric Logical Unit Access (ALUA) for volumes.

ALUA can be set for "Standard", "WSV", "SDV", "TPV", and "FTV" type volumes that are to be mapped.

Use this function only when controlling paths for each volume. For normal operation, paths for all the volumes in the LUN group with the host affinity setting are controlled according to the "Asymmetric / Symmetric Logical Unit Access" setting of the host response that is allocated to the host group or the host.

Caution

  • Rebooting the server is required after changing the ALUA settings.

  • The ALUA setting is enabled when all of the following conditions are satisfied.

    • The target volume is registered in a LUN group.

    • The host affinity is set for the relevant LUN group.

    • The TPGS mode for the relevant host affinity setting of the host group or the TPGS mode for the host response that is assigned to the host is "Enable (Default)".

  • When ALUA for the volume is not "Follow Host Response", ALUA is given priority over the "Asymmetric / Symmetric Logical Unit Access" setting that is specified for the host group with the host affinity setting or for the host response that is assigned to the host.

  • For volumes that are used with the Virtual Volume function, ALUA cannot be set.

Note

  • For the ALUA setting of each volume, refer to the "Performance (Host I/O)" screen.

  • If the ALUA setting is not changed by using this function, "Follow Host Response" is specified for all of the volumes that can be mapped.

User Privileges

Availability of Executions in the Default Role

Default role Availability of executions
Monitor  
Admin
StorageAdmin
AccountAdmin  
SecurityAdmin  
Maintainer

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

Settings

ALUA Settings

Item Description Setting values

New ALUA

Select the ALUA (access type from the host to the volume) that is specified for volumes.

  • Follow the Host Response

    Use the same "Asymmetric / Symmetric Logical Unit Access" setting as the host response for the host group or the host.

  • ACTIVE / ACTIVE

    All of the paths to the volume are regarded as being recommended paths. The use of a multipath driver determines which paths are used.

  • ACTIVE-ACTIVE / PREFERRED_PATH

    There are recommended paths and non-recommended paths for each volume. By using a CA port in the Controlling CM of a RAID group in which the volume belongs for the recommended paths (other ports are regarded as non-recommended paths), data migration between CMs (cross access) can be reduced.

Follow Host Response

ACTIVE / ACTIVE

ACTIVE-ACTIVE / PREFERRED_PATH

Display Contents

The current ALUA for the target volume is displayed.

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.

Standard

WSV

TPV

FTV

SDV
Usage

The usage of the volume is displayed.

Refer to "Usage" in "Volume (Basic Information)" for details.

Capacity

The volume capacity is displayed.

The displayed unit for the capacity ("MB", "GB", or "TB") is determined by the volume capacity.

Current ALUA

The current ALUA is displayed.

Follow Host Response

ACTIVE / ACTIVE

ACTIVE-ACTIVE / PREFERRED_PATH

Operating Procedures

  1. Select which volumes to set ALUA for (multiple selections can be made) and click [Set ALUA] in [Action].

    Caution
    • If a volume that cannot be mapped is selected, [Set ALUA] cannot be clicked. Conditions for volumes that cannot be mapped are as follows.

      • "SDPV" or "Temporary" type volumes

      • ODX Buffer volumes

      • "Usage" is "File", "System", or "Migration"

  2. Select a new ALUA, and click the [Set] button.

    → A confirmation screen appears.

  3. Click the [OK] button.

    → Setting of ALUA starts.

  4. Click the [Done] button to return to the [Performance (Host I/O)] screen.