Power 775 D-Link Service Procedure
PN: 41U8487, EC N44172
12 of 27
3
SERVICE PROCEDURE
STOP – Do not proceed
unless you have read “Safety_Notices_G229-9054.pdf” which is available
from InfoCenter; see Section 1.3.
Unless otherwise indicated, each step below is to be performed by the SSR (System Services
Representative).
3.1
Assess Impact on Cluster Performance <= Customer Task
STEP 1
Assess whether the expected performance impact due to removing multiple D-Link cables can be tolerated at this
time. If only discrete D-Link cables, without groupers, have been used in this installation, it may be possible to
clean or replace a cable without disturbing any other links. If groupers have been used in this installation, there
will be 16 total supernode-to-supernode D-links unidirectional half-links removed during this procedure, and there
may be significant system performance impact due to relying on indirect links.
If this procedure can be tolerated at this time, proceed to STEP 10.
If the procedure cannot be tolerated at this time, the system will continue to operate on the indirect paths until the
single link failure can be repaired.
STEP 2
Note carefully, using the lsnwlinkinfo command on the EMS, and cluster topology information, which D-Port at
each end of the cable is to be tested. If groupers are used, note particularly which groupers, and the positions of
the cable within the groupers at each end. Notify the SSR which two D-Ports are involved.
3.2
Identify the frame, CEC, and D-Port<= SSR Task
For each end of the suspect D-Link Cable do the steps in section 3.2.
STEP 3
Access the HMC via the keyboard/display that resides in the management rack.
STEP 4
Place a checkmark in the Select column of the CEC Drawer connected to the D-Link Cable needing service.
STEP 5
Click
the Tasks Menu button (right-arrow) and
select
Operations -> LED Status -> Identify LED
.
See Figure 1.
Figure 1 Identify LED Selection
