HP rp8420 HP 9000 rp8420 Server - User Service Guide, Fifth Edition - Page 91

Table 5-9 Disk Drive LEDs Activity LED Off Green Green Status LED Green Off Off Off Yellow Off Yellow Off Yellow Off Off Flash Rate Description Steady Normal operation, power applied Steady Green stays on during foreground drive self-test Flutter at rate of I/O Disk activity activity Flashing at 1Hz or Predictive failure, needs immediate investigation 2 Hz Flashing at 0.5Hz Operator inducing manually or 1Hz Steady Module fault, critical LEDs off Unit not powered or installed Server Management Subsystem Hardware Overview Server management for the HP 9000 rp8420 server series 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 allows 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 three 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 master 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 will also contain two MPs. In this case, the MP in slot 0 is the master MP and provides all of the server management functions. The MP on the core I/O board in slot 1 is a slave MP and redirects the operating system gettys to the master MP over an internal MP-to-MP link. All external connections to the MP must be to the master MP in slot 0. The slave MP ports will be disabled. For high availability (HA), the server powers up and powers down 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. Resetting the MP through a modem connection may cause Admin^M to display on every enter keystroke. Attempting a modem reset (MP command MR) does not clear this incorrect response. This is not experienced with a telnet connection. A new Login prompt regains control by following these steps: 1. Enter Admin (case sensitive) and press < ctrl +enter> keys. 2. A new Login prompt is created. 3. Re-enter Admin to move on to the Password prompt. 4. Enter Admin to reach the Main Menu. Server Management Subsystem Hardware Overview 91