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Volume
An IBM
®
ESA/390
®
term for the information recorded on a single disk unit or
recording medium. Indirectly, a volume can refer to the unit of recording medium
itself. On a non-removable medium storage device such as a disk drive, the terms may
also refer, indirectly, to the storage device that is associated with the volume. When a
user stores multiple volumes on a single storage medium transparent to the program,
the volumes are referred to as logical volumes.
WAN
Wide Area Networks or WANs are networks of computers that are geographically
dispersed and connected by radio waves, telephone lines, satellites, or high-speed fiber
optic backbones.
Workload
I/O workload refers to the pattern of I/Os presented to the Hitachi Freedom Storage
™
Lightning 9900
™
V Series system or to a disk drive.
WWN
World Wide Name(s) or WWN(s) refer to an eight-byte identifier assigned to each
product that can be used as a port on a Fibre Channel network. The WWN is stored
in nonvolatile memory and is frequently stamped on the surface of the product or used
as a serial number. It applies to all HBAs, switches, or storage controller cards that
interface to a Fibre Channel network.
XRC
Extended Remote Copy. The IBM implementation of a software asynchronous remote
copy technique that preserves data integrity. See also HXRC and Hitachi TrueCopy
™
.
zOS
™
IBM’s latest mainframe operating system.
Hitachi Data Sy s t e m s
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