Installation guide
Glossary-8 SPARC Enterprise Mx000 Servers Glossary • March 2012
I
I/O Backplane (IOBP) The backplane for the I/O device. See also Backplane (BP).
I/O boat A component used to provide an external I/O expansion unit with PCI slots.
Two types of I/O boards, a PCI Express (PCIe) I/O board and PCI-X I/O
board, are used. One I/O board can add up to six PCI slots. Up to two I/O
boards can be mounted in the external I/O expansion unit.
I/O Controller (IOC) A bridge between the system bus and I/O bus (PCI Express (PCIe))
The I/O Controller is connected to the Crossbar (XB) on the SPARC
Enterprise M9000 server or to the System Controller (SC) on the SPARC
Enterprise M8000 server.
I/O Unit (IOU) On SPARC Enterprise M8000/M9000 servers, a unit that can accommodate
eight PCIe slots and up to four HDDs. A PCI Express (PCIe) card, internal
drive connection card (IOUA), and link card can be inserted into PCIe slots
via a PCI cassette.
On SPARC Enterprise M4000/M5000 servers, an I/O Unit (IOU) that can
accommodate PCI Express (PCIe) and PCI-X cards. PCI cards are first
inserted into a PCI cassette and then the PCI cassette is mounted in the I/O
Unit. One I/O Unit can accommodate five PCI cassettes, four PCI Express
(PCIe) cassettes (upper four slots), and one PCI-X cassette (bottom slot). The
mechanism for connecting an internal drive is already mounted, but a link
card can be inserted.
install A term used in Dynamic Reconfiguration which represents the process of
incorporating a system board into a domain.
instant access CPU Synonymous with head room or headroom.
Inter SCF Network (ISN) A network that communicates between active XSCF and standby XSCF. It is
used when XSCF units are in redundant configuration.
IOBox Synonymous with an external I/O expansion unit. A PCI box may be
represented as an external I/O expansion unit in programs and manuals.
IOBP See I/O Backplane (IOBP).
IOC See I/O Controller (IOC).
IOU See I/O Unit (IOU).
IOUA See IOU Onboard Device Card (IOUA).
IOU Onboard Device
Card (IOUA)
An option for mounting CD-RW/DVD-RW drive units or tape drive units in
SPARC Enterprise M4000/M5000/M8000/M9000 server cabinets.