HP 3000 Manuals

Components of the Series 925 Through Series 949 Systems [ Performing System Management Tasks ] MPE/iX 5.0 Documentation

Performing System Management Tasks

Components of the Series 925 Through Series 949 Systems

The Series 925 through Series 949 systems (namely, Series 925, Series
925LX, Series 935, and Series 949 systems) can be housed in large or
small cabinets. The small rack-mount cabinet option contains the system
processor unit (SPU), CIO expander (optional for the 925), and the
battery backup unit (BBU). The large 1.6-meter cabinet can contain the
same components as well as several other peripherals.

Figure 12-4. Large and Small Cabinet Installations

Brief descriptions of the components of a Series 925 through Series 949
systems are as follows:

* The SPU houses system cards (memory, peripheral, processor) and
the power supply.

* The battery backup unit (BBU) supplies power to memory cards in
the event of a power failure.

* The CIO expander provides eight additional peripheral card slots
to the SPU.

* The disk drive is a nonremovable drive used to store data. Other
disk drive models are supported. Several disk drives can be
connected to the system.

* The tape drive is used initially to load the operating system.
Several tape drives can be connected to the system.

* The operating system resides on the system disk once it has been
installed.

* The system console is the terminal device designated to send and
receive system messages.

* Several types of page printers and line printers can be connected
to the system.

Switches and Lights on Series 925 Through Series 949 Systems

As system manager, you may need to turn off the computer system or report
system status to a Hewlett-Packard support representative when there is a
system problem. The large cabinet shown in Figure 12-5 has a power
breaker switch in the rear. Use the switch to turn on and off the SPU
and all of the peripherals connected to the power outlet inside the
cabinet. The small cabinet has no power outlet inside the cabinet, so
you turn off each unit with its own on and off switch.

Figure 12-5. Series 925 through Series 949 Switches and Lights

The same system status panel is on the front of both the large and small
cabinets and is shown in Figure 12-6 . It is used to view system
status and to enable remote access.

Figure 12-6. Series 925 through Series 949 System Status Panel

Viewing inside the panel, you see the following:

* a key switch to enable remote access

* an ON/STANDBY button used to turn the system on or off

* status lights that go on or off to display system status

* a red FAULT light that lights when a system fault condition has
occurred or during system startup

* a green RUN light that shows that the system is running

To remove the SPU Card Cage

The SPU card cage must be removed from the SPU before you can view the
cards. The system manager never needs to do this because Hewlett-Packard
support representatives normally remove the card cage to service the
system.

To understand the CIO expander

The channel input/output (CIO) expander is supported on Series 925
through Series 949 systems but not on Series 950 through Series 980
systems. As a system manager, you never have to access the inside of the
CIO expander. This is done by Hewlett-Packard support representatives
only; however, it is important to be familiar with what type of cards the
CIO expander supports when you are configuring your system.

The CIO expander provides eight additional (five supported) CIO card
slots to the SPU. The CIO card slots house the network, console, and
device adapter cards. These CIO cards are used to communicate between
the SPU and either networks, system consoles and remote consoles, or
various peripherals.

Figure 12-7. Series 925 through Series 949 CIO Expander

The CIO expander is connected with a cable to the processor-dependent
hardware (PDH) card on the Series 935 system and to a channel adapter
card on the Series 925 system.

CIO expander status lights.

The status lights are on the front of the CIO expander, as shown in
Figure 12-7 . The ON/STANDBY button is used to turn the CIO expander
on and off. The FAULT light and the RUN light indicate the following:

* The red FAULT light indicates that a fault condition has occurred.

* The green RUN light shows that the CIO expander is running.

NOTE If the red FAULT light goes on (the green RUN light goes off), call
Hewlett-Packard support personnel and report what the status lights
are displaying on the system status panel.

To understand the battery backup unit

There are two kinds of secondary power supplies supported on Series 900
computer systems:

* Battery backup units (BBU), which are supported on Series 925
through Series 949 systems. For information about BBUs, continue
reading this section.

* Uninterruptible Power Supplies (UPS), which are supported on the
Series 991 and 995. For information about UPS hardware and
software, read the next section.

The battery backup unit (BBU) is supported on Series 925 through Series
949 systems but not on Series 950 through Series 980 systems because they
already have a system-installed battery. The BBU provides power to the
memory cards for at least 15 to 25 minutes in the event of a power
outage. By knowing how to read the front panel, you can determine if the
system is running on the battery. The two lights on the front panel of
the BBU, in combination with the FAULT light on the SPU, give status
about the BBU. Figure 12-8 shows the BBU status lights. Table 12-2
(*) provides BBU status information.

Figure 12-8. BBU Status Lights

Table 12-2. BBU Status Lights

-------------------------------------------------------------------------------------------------
| | | | |
| AC Light | Battery Light | SPU - FAULT Light | BBU Status |
| | | | |
-------------------------------------------------------------------------------------------------
| | | | |
| ON | OFF | OFF | Battery in standby |
| | | | |
-------------------------------------------------------------------------------------------------
| | | | |
| ON | ON | OFF | Battery charging |
| | | | |
-------------------------------------------------------------------------------------------------
| | | | |
| ON/OFF | ON | ON | Battery discharging |
| | | | |
-------------------------------------------------------------------------------------------------

Battery status conditions are described as follows:

* Battery in standby is the normal operating condition. The battery
is recharged.

* Battery discharging condition occurs when power to the system has
failed and the BBU needs to provide power to the memory cards.

* Battery charging condition occurs when the battery has been
drained and needs to recharge. Power to the system has been
applied.

When the BBU is providing power to the memory cards, the BATTERY light is
on. In this state, the system is not available for command input. When
power returns to the system, the AC ON light comes on. If the BATTERY
light is still on, the BBU is still charging. The system resets and does
not clear memory. This condition is known as a return from power fail.
As power returns to the system after the BBU has returned to standby
condition, the system resets and clears memory.

MPE/iX 5.0 Documentation