82 IBM PureFlex System and IBM Flex System Products and Technology
With configurations between five and eight nodes, for N+1 a total of three Power supplies are
required (Figure 4-28).
Figure 4-28 N+1: Up to eight nodes are supported with three power supplies
For configurations greater than nine nodes, a total of four power supplies are required as
shown in Figure 4-29.
Figure 4-29 N+1 fully configured chassis requires four power supplies
A fully populated chassis can function on three power supplies. However, avoid this
configuration because it has no power redundancy in the event of a power source or power
supply failure.
4.8 Chassis Management Module
The CMM provides single chassis management and the networking path for remote
keyboard, video, mouse (KVM) capability for compute nodes within the chassis.
The chassis can accommodate one or two CMM. The first is installed into CMM Bay 1, the
second into CMM bay 2. Installing two provides CMM redundancy.
1
5
7
2
34
6
8
Node Bays
Front View
1
5
11
7
13
9
2
10
3 4
6
14
12
8
4
2
1
Rear View
Power Supply Bays
1
2
3
4
5
6
1
5
11
7
13
9
2
10
34
6
14
12
8
Node Bays
Front View
1
5
11
7
13
9
2
10
3 4
6
14
12
8
4
2
1
5
Rear View
Power Supply Bays
1
2
3
4
5
6
83
Table 4-8 lists the ordering information for the second CMM.
Table 4-8 Chassis Management Module ordering information
Figure 4-30 shows the location of the CMM bays on the back of the Enterprise Chassis.
Figure 4-30 CMM Bay 1 and Bay 2
The CMM provides these functions:
Power control
Fan management
Chassis and compute node initialization
Switch management
Diagnostics
Resource discovery and inventory management
Resource alerts and monitoring management
Chassis and compute node power management
Network management
The CMM has the following connectors:
USB connection: Can be used for insertion of a USB media key for tasks such as firmware
updates.
10/100/1000 Mbps RJ45 Ethernet connection: For connection to a management network.
The CMM can be managed through this Ethernet port.
Part number Feature code
a
a. The first feature code listed is for configurations ordered through System x sales channels. The
second feature code is for configurations ordered through the IBM Power Systems channel.
Description
68Y7030 A0UE / 3592 IBM Flex System Chassis Management Module
84 IBM PureFlex System and IBM Flex System Products and Technology
Serial port (mini-USB): For local serial (command-line interface (CLI)) access to the CMM.
Use the cable kit listed in Table 4-9 for connectivity.
Table 4-9 Serial cable specifications
The CMM has the following LEDs that provide status information:
Power-on LED
Activity LED
Error LED
Ethernet port link and port activity LEDs
Figure 4-31 shows the CMM connectors and LEDs.
Figure 4-31 Chassis Management Module
The CMM also incorporates a reset button. It has two functions, dependent upon how long
the button is held in:
When pressed for less than 5 seconds, the CMM restarts.
When pressed for more than 5 seconds (for example 10-15 seconds), the CMM
configuration is reset to manufacturing defaults and then restarts.
For more information about how the CMM integrates into the Systems management
architecture, see 3.2, “Chassis Management Module” on page 39.
Part number Feature code
a
a. The first feature code listed is for configurations ordered through System x sales channels. The
second feature code is for configurations ordered through the IBM Power Systems channel.
Description
90Y9338 A2RR / None IBM Flex System Management Serial Access Cable
Contains two cables:
Mini-USB-to-RJ45 serial cable
Mini-USB-to-DB9 serial cable
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