RA7000 and ESA10000 Storage Subsystems
1–28
EK–SMCPP–UG. A01
Figure 1–17 Cache-to ECB-Connection
1.10 Subsystem Cooling
As shown in Figure 1-18, the subsystem is equipped with eight dual-speed
blowers. These blowers pull air in from the front of the cabinet, through the
SBBs, controllers and EMUs, and exhaust it out the rear. Backplane connectors
p12 V dc to operate the blowers and route the blower status signals to
the shelf backplane and the EMU.
The EMU may be set to automatically increase fan speed or set to a constant
fanspeed of high. Refer to the CLI Reference Manual for the
set_emu
commands.
If set for automatic, the EMU switches all operational blowers from low-speed to
high-speed when one or more of the following conditions occur:
•
When a blower is removed
•
When a blower malfunctions
•
When a blower is not rotating at the right speed
•
When the EMU detects an over-temperature condition
When the fault condition is corrected, the EMU returns the blowers to low speed.
