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SnapScale/RAINcloudOS 4.1 Administrator’s Guide
GL - Master Glossary & Acronym List
PoP
Short for
Proof of Purchase
. The number used to obtain a license key for an upgrade to third-
party applications.
Portal
A target’s IP address together with its TCP port number used in iSCSI systems.
POSIX
Short for
Portable Operating System Interface
.
A set of standard operating system interfaces
based on the UNIX operating system. The need for standardization arose because enterprises
using computers wanted to develop programs that could run on multiple platforms without
the need to recode.
Protocol
A standardized set of rules that specifies the format, timing, sequencing, and/or error checking
for data transmissions.
PTP
Short for
Point-to-Point
. PTP is the common mode of attachment to a single host. PTP is
sometimes used to attach to a Fibre Channel switch for
connectivity.
Quota
A limit on the amount of storage space on a volume that a specific user or NIS group can
consume.
Router
A router is a device that enables connectivity between Ethernet network segments.
SAN
Short for
Storage Area Network.
Data storage connected to a network that provides network
clients access to data using block level protocols. To the clients, the data storage devices
appear local rather than remote. An iSCSI SAN is sometimes referred to as an IP-SAN.
SAS
Short for
Serial Attached SCSI
. It is a point-to-point serial protocol that replaces parallel SCSI
bus technology (multidrop) and uses the standard SCSI command set. It has no termination
issues, supports up to 16,384 devices (using expanders), and eliminates clock skew. It consists
of an Initiator that originates device service requests, a Target containing logical units that
receives device service requests, and a Service Delivery Subsystem that transmits information
between the Initiator and the Target.
Session
When an initiator wants to establish a connection with a target, it establishes what is known
as an iSCSI session. A session consists of one or more TCP/IP connections between an initiator
and a target. Sessions are normally established (or re-established) automatically when the
host computer starts up, although they also can be established (and broken) manually.
