APC SGI 15000 RAID - Manual (Page 69)

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]