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Controller Management
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Figure 3–28 Labeling a Controller Unit
3.2.12.4 Singlet
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.
3.3.1 Optimizing 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).
Enter the number of the unit you wish to rename.
15000 [1]: dual label
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]