Extreme Cache

Overview

This function displays the following Extreme Cache information.

  • The Extreme Cache setting (enabled or disabled)

  • Extreme Cache capacity of each CE

  • Setting contents of the tuning parameters

Caution

  • This function is supported in the ETERNUS DX500 S5/DX600 S5/DX900 S5 and the ETERNUS DX8900 S4.

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 Information

Item Description

Mode

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

Usage

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

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

Extreme Cache Detail Information

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

Item Description

Owner

All the CEs in the storage system are displayed.

Status

The status of the PFM in the relevant CE is displayed.

After PFMs are installed, if the Extreme Cache capacity is not specified, a "-" (hyphen) is displayed.

  • Available

    All PFMs are in the normal state.

  • Broken

    Some PFMs are in the broken state.

Capacity

The total capacity (TB) that can be used as Extreme Cache in the PFM installed in the relevant CE is displayed.

After PFMs are installed, if the Extreme Cache capacity is not specified, "0.0 TB" is displayed.

Extreme Cache 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 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.

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

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 is displayed.

Monitoring I/O

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

Read

Read / Write