Running diagnostics
You can run selected diagnostics on the nodes in an HCP system to help analyze and resolve issues related to interactions between the nodes and other components in the HCP environment. The available diagnostics let you:
- Ping a specified device (ping)
- Display the network path being used for communications between the node and a specified device (traceroute)
- Query the DNS for the records that match a specified IP address or domain name (dig)
- Display the routing table for the node (route)
- Display the NFS exports table for a specified device (showmount)
- On HCP SAIN systems, display information about the logical volumes that are mapped to the node on the Fibre Channel SAN arrays (fchbainfo)
- Display the ethtool command output command for both front-end interfaces (ethtool)
You run diagnostics from the system console for a node. To use the system console, you need a keyboard and monitor.
To run diagnostics, you use the Appliance Diagnostics menu. To display this menu in the system console, press Alt+F8.
Appliance Diagnostics ====================================== [1] ping - Check Network Connectivity [2] traceroute – Check Routing [3] dig - Check DNS Resolution [4] route - List the Kernel Routing Table [5] showmount - Show Exports from NFS Servers [6] fchbainfo - List Fibre Channel HBA and LUN Mapping Information [c] clear - Clear the Screen and Redisplay the Menu Enter a selection:
To run diagnostics from the Appliance Diagnostics menu:
- To execute a diagnostic command, enter the option number for that command. If the command requires an argument, HCP prompts you to enter a valid value for that argument. HCP then executes the command and displays the results on the screen.
- To cancel a command before it finishes, press Ctrl+C.
- If the information displayed in response to a command is longer than the space available on the screen, use Shift+PgUp and Shift+PgDn to scroll the display up or down, respectively.
- To return to the Appliance Diagnostics menu after viewing the information displayed by a command, press Enter.
- To clear the screen and redisplay the Appliance Diagnostics menu at the top, use option c from the menu.
- To return to the console login prompt from the Appliance Diagnostics menu, press Alt+F1.
In addition to being displayed on screen, the results of each diagnostic command that you execute are sent to the syslog servers that you specify on the Syslog page in the HCP System Management Console.
For more information about the diagnostic commands that you can execute from the Appliance Diagnostics menu, see the man pages for the commands on a Linux system.