ServerNet Cluster 6780 Operations Guide (G06.28+, H06.05+)

Glossary
ServerNet Cluster 6780 Operations Guide—525606-003
Glossary-22
ServerNet
systems; and return reply messages to the clients or requesters. A server process is a
running instance of a server program.
ServerNet. A communications protocol developed by HP that is used in NonStop S-series
servers. See also ServerNet I and ServerNet II.
ServerNet I. The first-generation ServerNet network. ServerNet I architecture is used in
current NonStop S-series servers and other products, and it features 50
megabytes/second speed, 6-port ServerNet routers, 8b/9b encoding, and a 64-byte
maximum packet size. See also ServerNet II.
ServerNet II. The second-generation ServerNet network. ServerNet II architecture is
backward-compatible with ServerNet I architecture, and it features 125 (or 50)
megabytes/second speed, 12-port ServerNet routers, 8b/9b and 8b/10b (serializer
ready) encoding, and a 512-byte maximum packet size. See also ServerNet I.
ServerNet adapter. A customer-replaceable unit (CRU) that connects peripheral devices to
the rest of the system through a ServerNet bus interface (SBI). A ServerNet adapter is
similar in function to an I/O controller logic board (LB) and backplane interconnect card
(BIC) in NonStop K-series servers.
ServerNet address. A virtual memory address that, when translated to a physical address,
indicates where the memory access needed by a ServerNet transaction begins. In
some cases, the translation can point to some entity other than memory, such as a
register. The ServerNet address is included in all ServerNet read request and write
request packets.
ServerNet addressable controller (SAC). An I/O controller that is uniquely addressable by
a ServerNet ID in the ServerNet fabrics. A SAC is typically implemented on some
portion of a processor multifunction (PMF) customer-replaceable unit (CRU), an I/O
multifunction (IOMF) CRU, or a ServerNet adapter.
ServerNet cable. A cable that provides ServerNet links between system enclosures.
ServerNet cluster. A network of servers connected together using the ServerNet protocol,
and sharing a common transport protocol for interprocessor communication across and
within a cluster. A ServerNet cluster offers fast end-to-end communication without
intermediate protocol stacks, achieving comparable speeds for internal and external
ServerNet communication. See also cluster.
ServerNet Cluster. The abbreviated product name for the collection of hardware and
software components that constitute a ServerNet cluster.
ServerNet cluster monitor process (SNETMON). A process pair named $ZZSCL that
manages the state of the ServerNet cluster subsystem. Each node (system) in a
ServerNet cluster must have one SNETMON process pair running. See also ServerNet
cluster subsystem.