Specifications
IBM TotalStorage Enterprise Storage Server
Specialist (ESS Specialist). Software with a
Web-browser interface for configuring the ESS.
IBM TotalStorage Enterprise Storage Server Copy
Services (ESS Copy Services). Software with a
Web-browser interface for configuring, managing, and
monitoring the data-copy functions of FlashCopy and
PPRC.
IBM TotalStorage Enterprise Storage Server Network
(ESSNet). A private network providing Web browser
access to the ESS. IBM installs the ESSNet software on
an IBM workstation called the IBM TotalStorage ESS
Master Console, supplied with the first ESS delivery.
IBM TotalStorage ESS Master Console (ESS Master
Console). An IBM workstation (formerly named the
ESSNet console and hereafter referred to simply as the
ESS Master Console) that IBM installs to provide the
ESSNet facility when they install your ESS. It includes a
Web browser that provides links to the ESS user
interface, including ESS Specialist and ESS Copy
Services.
ID. See identifier.
identifier (ID). A unique name or address that
identifies things such as programs, devices, or systems.
IML. See initial microprogram load.
implicit allegiance. In Enterprise Systems
Architecture/390, a relationship that a control unit
creates between a device and a channel path when the
device accepts a read or write operation. The control
unit guarantees access to the channel program over the
set of channel paths that it associates with the
allegiance.
initial microprogram load (IML). To load and initiate
microcode or firmware that controls a hardware entity
such as a processor or a storage server.
initial program load (IPL). To load and initiate the
software, typically an operating system that controls a
host computer.
initiator. A SCSI device that communicates with and
controls one or more targets. An initiator is typically an
I/O adapter on a host computer. A SCSI initiator is
analogous to an S/390 channel. A SCSI logical unit is
analogous to an S/390 device. See target.
i-node. The internal structure in an AIX operating
system that describes the individual files in the
operating system. It contains the code, type, location,
and owner of a file.
input/output (I/O). Pertaining to (a) input, output, or
both or (b) a device, process, or channel involved in
data input, data output, or both.
Internet Protocol (IP). In the Internet suite of
protocols, a protocol without connections that routes
data through a network or interconnecting networks and
acts as an intermediary between the higher protocol
layers and the physical network. The upper layer
supports one or more logical protocols (for example, a
SCSI-command protocol and an ESA/390 command
protocol). Refer to ANSI X3.230-199x. The IP acronym
is the IP in TCP/IP. See Transmission Control
Protocol/Internet Protocol.
invalidate. To remove a logical data unit from cache
memory, because it cannot support continued access to
the logical data unit on the device. This removal may be
the result of a failure within the storage server or a
storage device that is associated with the device.
I/O. See input/output.
I/O adapter (IOA). Input-output adapter on the PCI
bus.
I/O device. An addressable read and write unit, such
as a disk drive device, magnetic tape device, or printer.
I/O interface. An interface that enables a host to
perform read and write operations with its associated
peripheral devices.
I/O Priority Queueing. Facility provided by the
Workload Manager of OS/390 and supported by the
ESS that enables the systems administrator to set
priorities for queueing I/Os from different system
images. See multiple allegiance and parallel access
volume.
I/O processor (IOP). Controls input-output adapters
and other devices.
IP. See Internet Protocol.
IPL. See initial program load.
iSeries. An IBM Eserver product that emphasizes
integration.
J
Java virtual machine (JVM). A software
implementation of a central processing unit (CPU) that
runs compiled Java code (applets and applications).
JVM. See Java virtual machine.
K
KB. See kilobyte.
key field. The second (optional) field of a CKD record.
The key length is specified in the count field. The key
length determines the field length. The program writes
Glossary 193
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