HP StorageWorks SN6000 Fibre Channel Switch Installation and Reference Guide 57
• All power supply LEDs are normal, yet the System Fault LED is illuminated and the Heartbeat LED does
not show a blink pattern. This means that the two power supplies have different air flow directions.
Replace the power supply with the incorrect air flow direction with a power supply that has the correct
air flow direction. Air flow direction is marked on the power supply part number label. See ”Power
Supply Removal and Replacement” on page 61.
• Power Supply Fault LED is illuminated. This means that the power supply is failing or has failed.
Replace the power supply with a power supply that has the same air flow direction. Air flow direction is
indicated on the power supply part number label. See ”Power Supply Removal and Replacement” on
page 61.
Recovering a switch using maintenance mode
A switch can become inoperable or unmanageable for the following reasons:
• Firmware becomes corrupt
• IP address is lost
• Switch configuration becomes corrupt
• Password is forgotten
In these specific cases, you can recover the switch using maintenance mode. Maintenance mode
temporarily returns the switch IP address to 10.0.0.1 and provides opportunities to do the following:
• Exiting the maintenance menu (option 0), page 58
• Unpacking a firmware image file in maintenance mode (option 1), page 58
• Resetting the network configuration in maintenance mode (option 2), page 58
• Resetting user accounts in maintenance mode (option 3), page 58
• Copying log files in maintenance mode (option 4), page 58
• Removing the switch configuration in maintenance mode (option 5), page 58
• Remaking the file system in maintenance mode (option 6), page 58
• Resetting the switch in maintenance mode (option 7), page 59
• Updating the boot loader in maintenance mode (option 8), page 59
To recover a switch:
1. Place the switch in maintenance mode by pressing and holding the Maintenance button with a pointed
tool until only the Heartbeat LED is illuminated, and then release the button. The Heartbeat LED
illuminates continuously when the switch is in maintenance mode.
2. Establish a Telnet session with the switch using the maintenance mode IP address 10.0.0.1.
3. Enter the maintenance mode account name (prom) and password (prom), and press Enter.
Switch login: prom
Password:xxxx
4. The maintenance menu displays several recovery options. To select a switch recovery option, press the
corresponding number (displayed in option: field) on the keyboard and press Enter.
0) Exit
1) Image Unpack
2) Reset Network Config
3) Reset User Accounts to Default
4) Copy Log Files
5) Remove Switch Config
6) Remake Filesystem
7) Reset Switch
8) Update Boot Loader
Option:
These options and their use are described in the following subsections.
