SANsurfer iSCSI HBA Manager User’s Guide
Management Tool for QLogic iSCSI Host Bus Adapters
Glossary-4
IS0054602-00 B
S
IOCB
I/O control block. An IOCB is a command
structure in QLogic ISP architecture.
ioctl
Input/output control.
ioctl
is a system call
found on Unix/Linux systems, allowing an
application to control or communicate with
a device driver outside the usual read/write
operations.
IP
Internet Protocol is a method by which
data is sent from one computer to another
over the Internet. IP specifies the format of
packets, also called datagrams, and the
addressing scheme.
iSCSI
Internet small computer systems interface.
iSDMAPI
QLogic’s proprietary application program-
ming interface to manage QLA4
xxx
adapters.
iSNS
Internet Storage Name Service protocol
allows automated discovery, management,
and configuration of iSCSI and Fibre
Channel devices (using
iFCP
gateways)
on a TCP/IP network.
load balancing
A software feature that improves system
performance by balancing device access
between multiple QLA2
xxx
HBA
s for
maximum resource efficiency. This feature
is available in Windows 2000/Windows
Server 2003/Windows Vista, Novell
NetWare, and Red Hat/SUSE Linux.
(Windows XP and Windows Server 2008
do
not
support load balancing.)
loopback
A diagnostic tool where data is transmitted
and received by the QLA2
xxx
HBA
.
logical unit number
See
LUN
.
LUN
Logical unit number. A LUN is the small
integer handle that identifies a portion of
disk storage. A LUN can consist of a single
physical disk or many physical disks. A
physical disk can be broken into multiple
LUNs.
LUN masking
A software feature that assigns
LUN
s to
specific servers or hides LUNs from
specific servers for maximum access and
availability control.
MAC address
Media access control address. A unique
hardware device identifier used in
IP
address assignment.
media
Carriers of information.
FC
supports
several different physical media: copper,
multimode optical, and single-mode
optical, which differ mainly in the maximum
cable length. All FC protocols are
supported on all media.
NAS
Network attached storage. A hard disk
storage device that is set up with its own
network address rather than being
attached directly to the computer that is
serving applications or files to network
users.
