Enable Automatic Meta Cache Distribution

Overview

This function enables the automatic meta cache distribution.

If "Current Location" of the meta cache is different from "Initial Location", the meta cache of every NAS volume in the storage system is automatically returned to the initial location for the following times.

  • When the NAS Engine or the CM is activated

  • Every hour on the half hour

To redistribute the meta cache, using the [Initialize Meta Cache Distribution] function is recommended. If this function is used, a meta cache redistribution is performed every hour on the half hour regardless of the host I/O and the processes that are related to NAS may be delayed for a maximum of two minutes.

This function is used in a Unified Storage environment.

Caution
  • If the following operations are executed for NAS volumes where a meta cache redistribution is being performed, the process may be delayed for a maximum of two minutes in each NAS volume until the redistribution is complete.

    • Deletion of the NAS volumes

    • Displaying the NAS volume status

    • Displaying the shared folder list

    • Creation of the shared folders

    • Deletion of the shared folders

    • Modification of the shared folder settings

  • If the following operations conflict with the automatic meta cache distribution, the process that was started earlier is given priority.

    • Expanding the NAS user volume capacity

    • Backing up of the NAS user volume

    • Acquiring snapshots

    If the process that was started earlier is not complete within five minutes, an error occurs for the process that was started later.
  • Automatic meta cache distribution is executed when all of the following processes are complete.

    • Application of the controller firmware

    • Matching the controller firmware versions of both CMs (CM#0 and CM#1)

    • Activation of the CM

Note

  • The current and the initial meta cache locations can be checked. Refer to the [Meta Cache Distribution] function for details.

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.

Operating Procedures

  1. Click [Enable Automatic Distribution] in [Action].

    → A confirmation screen appears.

    Caution

    • [Enable Automatic Distribution] cannot be clicked if the automatic meta cache distribution is already enabled.

  2. Click the [OK] button.

    → Enabling of the automatic meta cache distribution starts.

  3. Click the [Done] button to return to the [Meta Cache Distribution] screen.