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16-Port Cards
(Slots 1-4 and 7-10)
Power LED (Upper LED)
Status LED (Lower LED)
Figure 18. LEDs on the WWN card and bezel
Interpreting POST
The switch performs a POST by default each time that you power on (cold start) the
chassis. You can restart the switch with the switchReboot, reboot, or fastboot
commands. The fastboot command restarts the switches without running a POST.
A CP card failover event results in a restart for the affected CP card.
POST includes a number of diagnostic tests. You can monitor the test results
through LED activity, the error log, or the command line interface. POST requires a
minimum of 3 minutes to complete (the time varies and depends on the devices
that are connected to the switch).
POST includes the following steps:
1. Running preliminary POST diagnostics
2. Initializing the operating system
3. Initializing the hardware
4. Running diagnostic tests on a number of functions, including:
The following switch initialization steps are performed whether or not a POST runs:
1. Configures the universal port.
2. Initializes the links.
3. Analyzes the fabric. If any ports connect to other fabric elements (switches), the
4. Obtains a domain ID and assigns port addresses.
5. Constructs unicast routing tables.
6. Enables normal port operation.
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IBM TotalStorage SAN Switch: 2109 Model M12 Installation and Service Guide
2 3 4 5 6 7 8
1
v Internal connections and circuitry
v Port function
v Ability to send and receive frames
v All aspects of memory, parity, and statistics counters
v Correct serialization
switch participates in a fabric configuration.
CP Cards (Slots 5 and 6)
Power LED (Upper LED)
Status LED (Lower LED)
9
10
Power Supplies
Power LED Left LED)
Status LED Right LED)
pwr4
pwr3
pwr2
pwr1
SJ000641
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