HMC Cabling and FSP

Cabling the HMC and FSP

Technote

This document shows how to cable the Ethernet connection from the HMC to the managed Server. It assumes the typical

configuration where the HMC eth0 port is configured as a DHCP server on a private network and cabled to the HMC1 on the

managed server. The location of the HMC eth0 port varies depending not only on the HMC model but also the number and

type of adapters as well as the version of HMC. The information contained in this document shows the typical location of

eth0 however it is highly recommended that you confirm the location by testing for link status changes.

Locating eth0 using link status

This technique assumes you have a good CAT 5 or CAT 6 Ethernet cable connected to another active Ethernet port (the FSP

HMCx port or a switch port). To use link status to locate eth0, do the following:

1. Check link status.

V7.3.3 and later: Click HMC Management , Test Network Connectivity , then click the Ethernet Settings tab. Note

the Link detected setting for each adapter (yes/no).

All Versions: Open a restricted shell terminal as hscroot. Enter the command tail -F /var/log/messages

2. Remove/Insert the cable to the typical eth0 location to change the link status.

Wait one minute for link status to change.

3. Check link status again.

V7.3.3 and later: Click the refresh button.

All Versions: Check the log for an entry with "ethx: .... Link is up" (active) or "ethx ... Link is down" (unplugged).

If the adapter reporting the link status change is not eth0, try another adapter.

Note: Starting with V7R3.3.0, the first boot after install fixes the eth0 interface location to a particular adapter by saving the location to disk. To check for this,you can view (in other words, with cat, less, or more) the net-persisent-names file located in /etc/udev/rules.d/30-net_persistent_names.rules. This file is used to

associate the interface to particular port so it will not change when adding an optional Ethernet adapter.

Rack HMC Model (7042-CR5 and CR6)

The additional dual port Ethernet card is standard on the CR5. eth0 is the port labeled Ethernet 1.

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Document information

i family

Software version:

V5R3M0, V5R3M5,

V5R4M0, V5R4M5,

V6R1M0, V6R1M1

Operating system(s):

OS/400

Reference #:

357481422

Modified date:

2011-10-31

IBM - Cabling the HMC and FSP http://www-01.ibm.com/support/docview.wss?uid=nas12642c378808c5bf686256f3300536834

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Rack-Mounted HMC Model (7310/7042-CR4)

Planar Board Ethernet 1

connecter (left)


connector (right)

Expansion adapter slot

(right)

Expansion adapter (left)

eth0 eth1 both empty

eth2 eth3 eth0 eth1

Note: When an optional 2 port PCI-X Ethernet adapter is installed in either of the optional PCI expansion slots, the right side Ethernet port becomes eth0(stamped act/lnk A). Port A is normally the right port when viewing the HMC from the back of the machine.


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Rack-Mounted HMC Model (7310/7042-CR3)


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connecter (left)


connector (right)

Expansion adapter slot

(right/only)

Expansion adapter slot (left)


eth1 eth2 eth0

eth2 eth3 eth0 eth1

Note: When an optional FC.5706, 2 port PCI-X Ethernet adapter is installed in either of the optional PCI expansion slots, the right side Ethernet port becomeseth0 (stamped act/lnk A). Port A is normally the right port when viewing the HMC from the back of the machine.

Rack-Mounted HMC Model (7310-CR2)

Back view of a rack-mounted HMC


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The location of the eth0 varies depending on the number of Ethernet adapters.

Planar Board Ethernet 1 connecter

(lower)

Planar Board Ethernet 2 connector

(upper)

Expansion adapter slot (either)


eth1 eth2 eth0

Floorstanding HMC Model (7310/7042-C06 and 7042-C07)

Back view of a stand-alone HMC


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eth0 will be the planar board connection (Ethernet) except when there is an Ethernet expansion adapter installed. When an Ethernet adapter is installed in an

expansion slot, it will become eth0, depending on what other options are installed. The general rules for the location of eth0 include:

o If there is only one single port Ethernet adapter installed in an expansion slot, it will be eth0.

o If there is only one dual port Ethernet adapter (FC.5706) installed in an expansion slot, the port stamped act/lnk A will be

eth0. The port marked A is normally the right port when viewing the HMC from the back of the machine.

One way to identify which port of which adapter is eth0 is to check the MAC address. On the HMC, run netstat -i -e from

the restricted shell or view lan adapter settings in Change network settings. This will show the MAC address of each

adapter for each interface. In the case of a dual Ethernet port adapter (FC.5706 ), the two MAC addresses will be the same

except for the last digit. eth0 will be the lower address (A), eth1 will be the larger address (usually A+1 or A+2 in hex).

For example:

eth0 00:14:5E:FB:91:10

eth1 00:14:5E:FB:91:12


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For some example configurations, refer to Table 3 .

Table 3. eth0 with 7310-C07, C06, C05 HMC

Planar Board Port Expansion Slot Expansion Slot Expansion Slot

eth0 empty empty empty

eth1 emptyeth0

(1 GB or 10/100 e-net)empty

eth2 emptyeth0, eth1

(dual port Ethernet adapter)empty

eth3eth*

(1 GB or 10/100 e-net)

eth*, eth*


eth4eth*, eth*

(dual port Ethernet adapter)

eth*, eth*


eth5eth*, eth*


eth*, eth*


eth*

(1 GB or 10/100 e-net)

Floorstanding HMC Model (7310/7042-C05)



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See Table 3 above.

Desktop HMC Models (7310/7042-C04)



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eth0 will be the planar board connection (Ethernet port 1) except when there is an Ethernet expansion adapter installed. Unlike like the 7310-C03, when a 10/100

e-net Ethernet adapter is installed in an expansion slot, it might become eth0, depending on the what other options are installed. The general rules for the location

of eth0 include:

o If there is only one 10/100 e-net adapter installed in an expansion slot, it will be eth0.

o If there are two 10/100 e-net adapters installed, the adapter in slot 1 will be eth0.

o If there is a 1 GB adapter and a 10/100 adapter installed, independent of position, the 1 GB adapter will be eth0 and

the 10/100 adapter will be eth1.

o If there are two 1 GB e-net adapters installed, the adapter in slot 1 will be eth0.

o If there is only one 1 GB e-net adapters installed in an expansion slot, it will be eth0.


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For some example configurations, refer to Table 2 .

Table 2. eth0 with 7310-C04 HMC

Planar Board port 1 Expansion slot 3 Expansion slot 2 Expansion slot 1


eth1 emptyeth0

(1 GB or 10/100 e-net)empty

eth2 emptyeth1

(10/100 e-net)

eth0

(10/100 e-net)

eth1eth0

(1 GB or 10/100 e-net)empty empty

eth2 emptyeth0

(1 GB e-net)

eth1

(10/100 e-net)

eth2 emptyeth1

(1 GB e-net

eth0

(1 GB e-net)

eth2eth0

(1 GB e-net)

eth1

(10/100 e-net)empty

Desktop HMC Models (7310-C03)



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5

eth0 will be the planar board connection (Ethernet port 1) except when there is a 1 GB Ethernet expansion adapter (FC.5701) in slot 2 or 3. Refer to Table 1 .Do not install an FC.5701 1 GB Ethernet PCI card in slot 1.

Table 1. eth0 with 7310-C03 HMC

Planar Board port 1 Expansion slot 3 Expansion slot 2 Expansion slot 1


eth1 emptyeth0

(1 GB e-net)empty

eth2eth1

(1 GB e-net)

eth0

(1 GB e-net)empty

eth1eth0

(1 GB e-net)empty empty


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eth1eth0

(1 GB e-net)empty

eth2

(any e-net)

eth2eth0

(1 GB e-net)

eth1

(10/100 e-net)empty

eth0 10/100 Ethernet adapters do not change the location of eth0

POWER7 ServersNote: On Power7 Systems, the FSP ports are no longer labeled HMC1 and HMC2.

8231-E1C POWER 710

8231-E2C POWER 730

8202-E4C POWER 720

8205-E6C POWER 740


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8202-E4B POWER 720

8205-E6B POWER 740

9117-MMB IBM Power 770

9179-MHB IBM Power 780

9117-MMC IBM Power 770


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9179-MHC IBM Power 780

8233-E8B IBM Power 750 Express

8236-E8C IBM Power 755


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POWER6 Servers

View of POWER6 525 models 9407-M15, 9408-M25, 8203-E4A


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View of POWER6 550 models 9409-M50, 8204-E8A


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View of POWER6 570 models 8234-EMA, 9117-MMA, and 9406-MMA


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POWER 5 Servers

Rear View of a Model 9406-520,515,525 Server

Rear View of a Model 9406-550 Server


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Rear View of a Model 9406-570 Server


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View of a Model 595


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HMC Cabling and FSP