IBM totalstorage 326, User Reference

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Attaching to the serial port while the hub is on
1. If the hub is on, you can attach your service terminal, login, and run most
diagnostics. However, you need to get an administrator username and password
recognized by the hub from the system administrator.
2. After you get an administrator username, stop any Ethernet session active on
the Ethernet port.
3. Attach your service terminal to the serial port on the hub. The Ethernet port and
the serial port are mutually exclusive.
4. When prompted, log in with the appropriate username and password. The
password does not display as you type it in. The hub responds:
Username>
You can now type any diagnostic command and observe the results as they are
logged to your service terminal.
Running diagnostics from a Telnet session on the Ethernet
The easiest way to run diagnostics is through a LAN-attached server that can
access the hub Ethernet port.
You need to get an administrator-level username and password from the system
administrator, as well as the hub IP address or name.
Perform the following steps:
1. Go to the server with LAN access and, in an open window, type:
telnet Ipaddress or name (the hub IP address or name you were given by the system administrator)
2. Type the username you were given and press Enter. The hub responds:
Ipaddress password :
3. Type the password you were given. The hub responds:
Username>
You can now run any of the diagnostics and observe the results as the hub displays
them in your Telnet session.
Diagnostic tests during POST
Table 29 lists the diagnostic tests that are automatically run during POST.
Table 29. Hub POST diagnostic tests
Test Checks
Memory test CPU RAM memory.
Port register test ASIC registers and SRAMs
Central memory test System board SRAMs
CMI conn test CMI bus between ASICs
CAM test CAM
Port loopback test All of the hub hardware: frames are
transmitted, looped back, and received
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Model 326 User’s Reference