APC 15000 RAID manual Performance Management, Optimizing I/O Request Patterns, Singlet

Controller Management

15000 [1]: dual label

Enter the number of the unit you wish to rename.

LABEL=1 for unit 1, Test System[1]

LABEL=2 for unit 2, Test System[2]

unit: 1

Enter a new label for unit 1, or DEFAULT to return to the default label. Up to 31 characters are permitted.

Current unit name: Test System[1]

New unit name: System[1]

Figure 3–28Labeling a Controller Unit

3.2.12.4Singlet

The DUAL SINGLET command sets the system in the singlet mode. System recognizes only Unit 1. This command:

•disables cache coherency

•heals unit 1 if it is failed

•fails unit 2 before attempting to remove it.

To set the system in singlet mode not couplet mode, type: dual singlet<Enter>.

NOTE : The system may automatically add unit 2 if it is connected to the system. Therefore, we advise you to power off and remove unit 2 from the system after the Dual Singlet command is completed.

3.3 Performance Management

The controller optimizes performance operations due to its extensive monitoring and reporting capability.

3.3.1Optimizing I/O Request Patterns

The controller manages pre-fetch and cache efficiency through the LUN.

Display Current Cache Settings

The CACHE command displays the current cache settings for each LUN in the system( Figure 3–29).

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