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2.4 Disk Units
The denominator indicates the size of the memory module for a slot (unit: megabytes); 0* indicates
a faulty slot. The numerator indicates the size of the memory that is actually available for use. The
numerator 0 indicates that no memory is used.
In this example, DIMMs are installed in slots 0 to 7. The size of each module is 32 megabytes
except the one installed in slot 5. The initial system diagnostics detected an error in the module
installed in slot 5 and placed the module in degraded mode, assuming there was no available space.
As a result, the group of modules in slots 4 to 7 is not available for use.
2.4 Disk Units
Disk drive configuration
When the Disk Expansion Unit (which includes an expansion disk cage) is added, up to 8 disk units
can be installed in the M200 main cabinet. Basic disk cage (bay #0-#3) is connected to UltraSCSI
bus, and the expansion disk cage (bay #0-#3) is connected to another UltraSCSI bus. Each disk
drive has two status LEDs. For the status of these LEDs, refer to 11 , "Input-Output Units."
ACTIVE LED( Green )
FAULT LED( Amber )
#0
#1
#2 #3
#0
#1
#2 #3
POWER LED
Expansion disk cage
Basic disk cage
Figure 2.5 Disk Drive Bays of M200 Main Cabinet
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