Bull Escala Power7 Series, Manual

Page: 51 / 148

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Before performing any procedure that involves changes to the 12X cabling or configuration for a
system that is managed by an HMC, obtain a record that identifies for each expansion unit which I/O
buses exist in that expansion unit. To acquire this information, use one of the following methods:
– From an HMC or SDMC, select the managed system and then select the
Properties task.
– From the HMC command line, enter the command
lshwres –r io ——rsubtype bus –m managed
system
.
– From the SDMC command line, enter the command
smcli lshwres –r io ——rsubtype bus –m
managed system
.
About this task
To remove an I/O expansion unit from the system configuration that has the system powered off,
complete the following steps:
Procedure
1.
If the system is powered on, power it off.
2. Remove ac power from the expansion unit that is to be removed by disconnecting the ac cables from
the power supplies on the expansion unit.
3. Familiarize yourself with the SPCN cabling rules. For SPCN cabling examples, see “Examples: SPCN
connections” on page 19.
4. Perform the following steps:
a. Remove the SPCN cable between the SPCN 0 connector on the expansion unit that is to be
removed and the corresponding connector on the preceding unit on the SPCN loop.
Note: The preceding unit on the SPCN loop might be another expansion unit or a system unit.
b.
Disconnect the SPCN cable from the SPCN 1 connector on the expansion unit that is to be
removed. Attach that end to the connector on the preceding unit on the SPCN loop that was
opened in the previous step.
5. Familiarize yourself with the 12X cabling rules. For 12X examples, see “Examples: 12X connections”
on page 16.
6. Choose from the following options for removing an expansion unit from a 12X loop.
Note: To review the connector locations for your expansion unit, see “Connector locations” on page
115.
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To remove an expansion unit from a 12X loop that has only one expansion unit, continue with
step 7.
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To remove an expansion unit from a 12X loop that has more than one expansion unit, continue
with step 8.
7. To remove an expansion unit from a 12X loop with only one expansion unit, complete the following
steps:
a. Remove the 12X cable between connector T1 on the system unit and connector T1 on the
expansion unit that is to be removed.
b. Remove the 12X cable between connector T2 on the system unit and connector T2 on the
expansion unit that is to be removed.
c. Continue with step 9 on page 40.
8. To remove an expansion unit from a 12X loop that contains multiple expansion units, complete the
following steps"
a.
Remove the 12X cable between connector 0 on the expansion unit to be removed and the
corresponding connector on the preceding unit on the 12X loop.
Note: The preceding unit on the 12X loop might be another expansion unit or a system unit.
I/O expansion units
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