Extreme Cache Pool

Overview

This function displays the following Extreme Cache Pool information.

  • The Extreme Cache Pool setting (enabled or disabled)

  • Extreme Cache Pool capacity of each CM

  • Setting contents of the tuning parameters

Caution

  • This function is supported in the ETERNUS DX100 S5/DX200 S5.

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.

Display Contents

Extreme Cache Pool Information

Item Description

Mode

Whether the Extreme Cache Pool for the storage system is enabled or disabled is displayed.

Usage

The usage of the Extreme Cache Pool (Read-Only Cache) is displayed.

This item is not displayed if "Mode" is "Disable".

Extreme Cache Pool Detail Information

The following items are only displayed when "Mode" is "Enable".

Item Description
CM

All the CMs in the storage system are displayed.

CM#x

x: CM number
Capacity

The Extreme Cache Pool capacity (GB) that is set to the relevant CM is displayed.

If the Extreme Cache Pool capacity is not specified, "0 GB" is displayed.
Encryption by CM

The encryption status of the Extreme Cache Pool area is displayed.

  • On

    The Extreme Cache Pool area is encrypted by CM.

  • On (SED)

    The Extreme Cache Pool area is encrypted by using SSD SEDs.

  • Off

    The Extreme Cache Pool area is not encrypted.

Extreme Cache Pool Tuning Parameter Information

The following items are only displayed when "Mode" is "Enable".

Item Description

Initial Caching Threshold

The threshold (1 to 16) that affects how frequently data is stored in Extreme Cache Pool is displayed.

If the set value is exceeded, it is assumed that the relevant data is read frequently and the data is stored in Extreme Cache Pool.

This parameter specifies the threshold value that is used until the Extreme Cache Pool memory is full after Extreme Cache Pool is enabled.

Caching Threshold

The display contents vary depending on whether the cache data is relocated.

If the cache data is relocated, "Caching Threshold" (1 to 16) is displayed as the threshold after the Extreme Cache Pool memory is full.

If "Caching Threshold" is exceeded, it is assumed that the relevant data is read frequently and the data is stored in Extreme Cache Pool.

If the cache data is not relocated, "Not relocate Cache Data" is displayed.

Caching Priority

The concurrency (1 to 9 or 10 (Fastest)) of the staging process when data is stored in Extreme Cache Pool is displayed.

Monitoring I/O

The I/O type for storing data in Extreme Cache Pool is displayed.

Read

Read / Write