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run concurrently. Reliability is enhanced with retry logic, alternate path routing, and
restart from point of failure. Ease of use is provided by a Java-client interface, a system
monitor, scheduling support, and remote control of client functions from OS/390
®
.
HDD
High-density disks. Used in the Lightning 9900
™
Series.
HDmS
The Hitachi Data Systems Migration Service
™
(HDmS) is a Hitachi Data Systems
®
professional service that helps users migrate data from existing systems to newly
installed systems while minimizing the impact on mission-critical applications.
HDmS features a four-phase approach that includes assessment, planning, migration,
and post-migration support.
Hitachi CruiseControl
™
CruiseControl
™
automatically monitors, analyzes and moves logical volumes to
eliminate “hot spots” within a Lightning 9900 storage system and provides load
balancing to maintain predetermined performance levels.
Hitachi Dynamic Link Manager
™
Hitachi Dynamic Link Manager
™
is a family of software utilities that is server based
and enhances RAID systems by providing automatic failover and load balancing
from server-to-RAID channel connection failures. This product allows systems
administrators to take advantage of the multiple paths on a Lightning 9900
™
by
adding redundant SCSI connections between data servers and RAID systems. Hitachi
Dynamic Link Manager
™
therefore provides increased reliability and performance.
Supported platforms include AIX
®
, Sun Solaris
™
, and Windows NT/2000
®
.
Hitachi FlashAccess
™
FlashAccess
™
is a Hitachi feature that allows specified (usually high access) data sets to
be “pegged” or permanently placed in cache memory so they are not managed by the
data movement algorithms of the Freedom Storage
®
system. The Hitachi Flash Access
™
feature in the Lightning 9900
™
can be used for either S/390 or open systems. Hitachi
Flash Access
™
is a software utility in the Freedom 9000 Resource Manager
™
suite that
allows the creating, deletion, and monitoring of data managed by the Hitachi Flash
Access
™
software. See also Freedom 9000 Resource Manager
™
.
Hitachi Graph-Track
™
Graph-Track
™
is a software utility in the Freedom 9000 Resource Manager
™
suite
that allows a robust set of system and network management utilities and provides
graphical reports for Lightning 9900
™
performance and availability and configuration
management.
Hitachi Hi-Star
™
Architecture
At the heart of the Lightning 9900
™
revolutionary design is the Hitachi Hi-Star
™
Architecture, which provides multiple, redundant, non-blocking paths between the
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Glossary