User Service Guide, Fifth Edition - HP Integrity rx8640 SEU

contains clock generation circuits, manageability circuits, DC-to-DC converters, power monitor
logic, and fan control.
Core I/O Backplane Module
The core I/O backplane is housed in a separate sheet metal module holding the backplane and
the core I/O boards. This module can be removed from the rear of the chassis for easy access to
the core I/O backplane.
The module adapts the core I/O sockets in a horizontal mounting position to the system backplane,
which is mounted vertically. It contains the lower bus adapter (LBA), PCI bridges that convert
the ropes links from the PCI backplane to the PCI bus interface where the core I/O card is inserted.
It also drives the PCI clocks and voltage regulators that provide domain power to the core I/O
cards.
Core I/O PCA
There are two core I/O boards plugged into the SEU system when shipped. The core I/O boards
are oriented horizontally and are accessed from the back of the SEU. They are not a standard
PCI form factor. Each core I/O contains the required core functions to support a partition in a
server. Each also contains a manageability processor (MP).
Neither of the MPs on the core I/O cards installed in the SEU can become the primary MP for
the server and SEU combination. The primary MP for the server and SEU will always be one of
the core I/O cards installed in the server.
When a server with an SEU is attached and configured for four partitions, there must be four
core I/O boards, one for each partition. For this configuration, one core I/O card in the server is
the primary MP and will provide all of the server management functions. The second core I/O
in the server is the secondary MP. The third and fourth core I/O cards located in the SEU have
similar primary and secondary characteristics but only within the SEU itself. Overall system
management for the combination of the server and the SEU is managed by the primary core I/O
in the server. Console data from the SEU is directed to the server.
The core I/O cards in the SEU support the mass storage and removable media devices and make
them available to the server in the same manner as the servers internal devices. The core I/O card
in the upper slot is the secondary core I/O card in the SEU and is associated with cell 3 in the
main server cabinet. The core I/O card in the lower slot is the primary core I/O card in the SEU
and is associated with cell 2 in the main server cabinet.
Core I/O Boot Paths
The SEU internal I/O devices are located on the core I/O. The following table outlines the paths
assigned to the hard disk and removable media disk bays located on the front of the SEU cabinet.
Core I/O card 2 refers to the core I/O located in the bottom slot at the rear of the system. Core
I/O card 3 refers to the core I/O card located in the top slot at the rear of the system. Core I/O
cards 0 and 1 are located in the server.
Table 1-1 SEU Core I/O Boot Path
DescriptionPathDeviceCore I/O card
The SYS LAN connector located on core I/O 2.2/0/0/1/01 Gb LAN2
Hard drive located in the top left disk bay.2/0/0/2/0.6.0SCSI drive2
Removable media DVD (X = 2) or DDS-4 (X = 3) tape drive
located in the upper disk bay.
2/0/0/2/1.X.0SCSI drive2
Hard drive located in the top right disk bay.2/0/0/3/0.6.0SCSI drive2
SCSI drive connected to the external SCSI Ultra3 connector on
the core I/O card.
2/0/0/3/1SCSI drive2
Core I/O Backplane Module 17