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HSN
Hierarchical Star Network. The technical term used to describe the combined internal
networks (the C–HSN and the CM–HSN) of the Lightning 9900
™
Series.
Hub
A common connection point for devices in a Fibre Channel network. A hub contains
multiple ports. When a Fibre Channel packet of data arrives at one port, it is copied to
the other ports so that all storage devices on a SAN can see all packets.
HXRC (Hitachi Extended Remote Copy)
This is Hitachi Data Systems
®
IBM XRC
®
compatible host-based software asynchro-
nous remote copy. Using System Data Mover software it guarantees data integrity for
dependent write applications.
HYPERtape
An enterprise backup/restore solution that leverages current customer investments.
HYPERtape is a three-tier distributed system architecture with central administration
and control that supports consolidated and distributed environments. HYPERtape can
be used to back up data from any supported host to any system that supports the ftp
protocol, including backup to disk for HSM integration or backup to local- or
network-attached tape. Over 30 host platforms are covered and 70 library modules are
supported. All popular RDBMS programs are supported including Oracle
®
, SAP
®
R/3,
Informix
®
, Sybase
®
, DB2
®
, Adabas-D RDB, and Microsoft SQL Server
®
, Exchange
®
,
and Windows NT/2000
®
registry.
IP
The IP (Internet Protocol) is the underlying protocol for routing packets on the
Internet and other TCP/IP-based networks. IP is an internetwork protocol that
provides a communication standard that works across different types of linked
networks, for example Ethernet, FDDI, or ATM.
Java
Developed by Sun Microsystems
®
, Java is now a standard software language for
developing plug-in applications.
Journaling
A journaling file system keeps track of all changes to files as transactions occur in real
time. In the event of unexpected system problems, the file system can be restored to a
consistent state by updating a prior copy of the file system for the changes made from
the point in time that the copy was made.
LAN
Local area networks or LANs are networks of computers that are geographically close
together; this usually means on the same campus. Most LANs are confined to a single
building or group of buildings. However, one LAN can be connected to other LANs
over any distance via telephone lines, high-speed fibre optic backbones, and radio
waves. A system of LANs connected in this way is called a wide-area network (WAN).
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