System Control Board (Sc) Replacement Procedures - Sun Microsystems Sun Fire E25K Service Manual

SC CPU Abort Button
I
When the ABORT button on the front panel of the SC CPU board is pressed, an
external initiated reset (XIR) is generated to the CPU module, returning the CPU
to a known start-up state. No other devices are affected by this reset.
6.1.2 System Control Board (SC) Replacement
Procedures
6.1.2.1 Isolating a Failed System Control Board
1. Check for any error messages during SCPOST.
SCPOST messages are output to an SMS console. To read SC SMS console messages,
you must attach a console cable and terminal to the SC.
2. On the SC, check for any error messages in /var/adm/messages and
/var/opt/SUNWSMS/adm/platform/messages.
3. Use adb to examine any core files in /var/crash/sc_name.
6.1.2.2 Powering Off a System Control (SC) Board
1. If the System Control board is to be replaced in the spare SC, go to
follows. If the System Control board is to be replaced in the main SC, ensure the
spare SC is available. Synchronize the main SC to the spare SC by typing:
sc% setdatasync backup
If no messages are reported in /var/opt/SUNWSMS/adm/platform/messages
and the command completes, the setdatasync backup was successful.
2. As a superuser on the main SC, make a backup copy of the SMS configuration:
sc# smsbackup directory
This smsbackup file can be used to recover the SMS configuration in the event of
another failure during the replacement.
6-4 Sun Fire E25K/E20K Systems Service Manual • April 2004
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