ZS4-4 Controller Hardware Overview
Each memory riser card contains twelve DIMM slots, four DDR3 channels, and two memory
buffer ASICs. Each each memory buffer has two channels (A and B) and links to three
DIMM slots per channel. Each memory buffer is connected to the processor's built-in memory
controller by an SMI-2 link.
DIMM names in appliance logs and the Maintenance > Hardware view are displayed with the
full name, such as /SYS/MB/P0/D7.
For more information about memory layout and procedures for replacing DIMMs, see
“Replacing a ZS4-4 DIMM” on page 62.
ZS4-4 Cooling Subsystem - The ZS4-4 internal components are cooled by air that is pulled in
through the front of the controller and exhausted out the back of the controller. Cooling occurs
in two areas of the chassis: the power supply area and the motherboard area.
The following figure shows the cooling zones and the approximate location of the temperature
sensors. The accompanying legend table provides sensor NAC names and sensor motherboard
designations.
86 Oracle ZFS Storage Appliance Customer Service Manual • July 2016
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