NonStop System Glossary

power and cooling for the enclosure. An I/O enclosure is identical to a processor enclosure except
that it contains I/O multifunction (IOMF) customer-replaceable units (CRUs) instead of processor
multifunction (PMF) CRUs.
I/O interface board
The circuit board located at the bottom of the NonStop Blade Element that provides connections
for the Blade optics adapters.
I/O multifunction (IOMF) CRU
1. A NonStop S-series customer-replaceable unit (CRU) that connects an I/O enclosure to a
processor enclosure through a ServerNet cable and supplies power to the components within the
IOMF CRU as well as redundantly to the disk drives, SCSI terminators, and ServerNet adapters in
that enclosure. The IOMF CRU contains a power supply, a service processor (SP), a ServerNet
router, an Ethernet controller, an external ServerNet port, and three SCSI ServerNet addressable
controllers (S-SACs) in a single unit.
2. A collective term for both IOMF CRUs and IOMF 2 CRUs when a distinction between the two
types of CRUs is not required.
I/O multifunction (IOMF) 2 CRU
A NonStop S-series customer-replaceable unit (CRU) that connects an I/O enclosure to a processor
enclosure or a processor switch through a ServerNet cable and supplies power to the components
within the IOMF 2 CRU as well as redundantly to the disk drives, SCSI terminators, and ServerNet
adapters in that enclosure. The IOMF 2 CRU contains a power supply, a service processor (SP),
a ServerNet router 2, an Ethernet controller, three configurable ServerNet ports, and three SCSI
ServerNet addressable controllers (S-SACs) in a single unit.
IOAM
See I/O adapter module (IOAM).
IOAM enclosure
See I/O adapter module (IOAM) enclosure.
IOMF CRU
See I/O multifunction (IOMF) CRU.
IOMF 2 CRU
See I/O multifunction (IOMF) 2 CRU.
IOP
See input/output process (IOP).
IP
See Internet protocol (IP).
IP address
An address that uniquely identifies a specific host system within a network to the Internet protocol
(IP). An IP address consists of two parts: a network address, which identifies the network, and a
local address, which identifies the host within the network. IP routes data between source and
destination IP addresses.
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