Sun Microsystems StorEdge, Troubleshooting Manual

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98 Sun StorEdge SAN 4.0 Release Field Troubleshooting Guide • October 2002
Power On Self Test (POST)
When the switch is powered up, it runs a series of POST tests including:
■
Dynamic RAM Test
■
Port Register Test
■
Central Memory Test
■
CMI Connector Test
■
CAM Test
■
Port Loop Back Test
POST behaves differently, depending on boot method. A power-cycle (power-off and
power-on) is considered a cold boot. All other boots from a powered-on state are
considered warm boots.
POST execution per cold boot executes a longer version of the Memory Test. POST
execution per warm boot executes a shorter version of Memory Test. Boot time with
POST varies, depending on boot method.
As the POST test successfully performs each test, a message “Passed” is displayed
via telnet on the front panel.
After the switch completes the POST, the port module returns to a steady state from
the flashing state shown during tests.
If a yellow port module light is displayed or is slowly flashing, this indicates that the
port is in a failed state.
Should the switch fail to complete POST, the green power LED will be set to blink.
This indicates that the switch failed one of the initial stages of POST and that the
CPU is not able to bring up the operating system. Should this occur, replace the
switch.