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Enterprise Systems Connection architecture (ESCON)
ESCON
ESCON channel
ESCON host systems
fabric
fibre-channel
fixed-block (FB) devices
gigabyte (GB)
host adapter
IBM Enterprise Storage Server (ESS)
xiv
ESS Introduction and Planning
1. An ESA/390 computer-peripheral interface. The
I/O interface uses ESA/390 logical protocols
over a serial interface.
2. A set of IBM products and services that provide
a dynamically connected environment within an
enterprise.
See Enterprise Systems Connection architecture .
A channel that has an ESCON channel-to-controller
I/O interface that uses optical cables as a
transmission medium.
System/390 hosts that you attach to the ESS with
an ESCON adapter. Such host systems run on
Multiple Virtual Storage (MVS), virtual machine
(VM), VSE, or TPF operating systems.
In fibre-channel technology, a routing structure,
such as a switch, receives addressed information
and routes to the appropriate destination. A fabric
can consist of more than one switch. When multiple
fibre-channel switches are interconnected, they are
cascaded .
Fibre-channel is an architecture that supports
full-duplex communication over a serial interface
that configures attached units to a communication
fabric.
The ESS supports fibre-channel communications for
open system hosts through its fibre-channel
adapters.
An architecture for logical devices that specifies the
format of the logical data units on the device. The
logical data unit is a block. All blocks on the device
are the same size (fixed size); the subsystem can
access them independently. This is the required
format of the logical data units for host systems that
you attach with a small computer system interface
(SCSI) or fibre-channel interface.
When referring to hard-disk-drive capacity, GB
means 1 000 000 000 bytes; total user-accessible
capacity may vary depending on operating
environment.
A physical component in a storage server that
enables the server to attach to one or more host
I/O interfaces.
A member of the Seascape
storage servers and attached storage devices (disk
drive modules). The ESS provides integrated
caching and RAID support for the disk drive
modules (DDMs). The DDMs are attached through
a serial storage architecture (SSA) interface.
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product family of
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