HP rp7420, Service Manual, Page: 78 / 127

Figure 5-10 Disk Drive LED Location
Table 5-10 Disk Drive LEDs
Description Flash Rate Status LED Activity LED
Normal operation, power applied Steady Green Off
Green stays on during foreground drive self-test Steady Off Green
I/O Disk activity Flutter at rate of
activity Off Green
Predictive failure, needs immediate investigation Flashing at 1 Hz
or 2 Hz Yellow Off
Operator inducing manually Flashing at 0.5 Hz
or 1 Hz Yellow Off
Module fault, critical Steady Yellow Off
Unit not powered or installed LEDs off Off Off
Server Management Subsystem Hardware Overview
Server management for the HP 9000 rp7420 server is provided by an MP on the core I/O board.
The server management hardware is powered by standby power that is available whenever the
server is plugged into primary AC power. This enables service access even if the DC power to
the server is switched off.
The MP communicates with the server subsystems, sensors, and PDC by internal buses. It also
communicates with the operating console and session gettys by universal asynchronous
receiver-transmitters (UARTs) on the core I/O PCI bus.
Connection to the management processor is by way of two I/O paths:
• An RS-232 port for a local terminal
• An RS-232 port for a modem connection
• A 10/100/1000 baseT LAN port (Web console)
When the server is configured with one core I/O board, that board must be in slot 0, since the
primary MP is always the MP on the core I/O board in slot 0.
When the server is configured for two partitions, it must contain two core I/O boards, one for
each partition. It also contains two MPs. In this case, the MP in slot 0 is the primary MP and
provides all of the server management functions. The MP on the core I/O board in slot 1 is a
secondary MP and redirects the operating system gettys to the primary MP over an internal
MP-to-MP link. All external connections to the MP must be to the primary MP in slot 0. The
secondary MP ports are disabled.
For high availability (HA), the server powers on and powers off without an MP. Booting HP-UX
without an MP depends on the ability of the operating system to boot without a console getty.
Thus, in a two-partition system, the partition with a failed MP might not boot, since the MP
provides the console getty.
The server configuration cannot be changed without the MP.
78 Troubleshooting