.SAN design reference guide Vol. 1-5 785350-001

out-of-band
communication
Communication through a different communications channel than that used by operational data.
oversubscription When transmissions from one or more devices exceed the capacity of an ISL or port.
P
PAP Password Authentication Protocol. A security protocol.
PCM Power and control modules.
PDC Processor-Dependent Code.
PDU Protocol data unit.
PFC Priority flow control.
PIC Plug-in card. A hardware component of the HP NonStop server.
PKI Public key infrastructure. A data encryption technology.
platform A combination of supported hardware components and operating system on a server from a
specific vendor.
pWWN Port World Wide Name. Synonymous with WWPN.
Q
QoS Quality of service. A traffic management feature.
R
RADIUS Remote Authentication Dial-In User Service. A client-server protocol that protects networks against
unauthorized access.
RBAC Role-based acess control. A Fabric OS feature used to determine which commands are supported
for each user.
RCS Remote copy set.
RCU Remote control unit.
RHEL Red Hat Enterprise Linux.
RMON Remote Monitoring. Cisco fabric monitoring software.
RPO Recovery point objective. A disaster recovery concept that defines what an organization considers
as an acceptable loss in terms of time.
RSPAN Remote Switched Port Analyzer.
RTO Recovery time objective. A disaster recovery determination of when the recovery site is to be
used.
RTT Round-trip time.
RU Rack unit.
RVU Release version updates.
S
SA Service Agent. An iSCSI software component.
SAN Storage area network. An intelligent infrastructure that connects heterogeneous servers with
shared, heterogeneous storage systems.
SAN-OS SAN Operating System (Cisco).
SAS Serial Attached SCSI. A bus technology used to transfer storage data.
SATA Serial Advanced Technology Attachment. A bus technology for storage devices.
SC Subscriber connector.
SCC Switch Connection Control. A data access policy that determines to which switches a switch can
join.
414 Glossary