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H
The capacity to transmit in two directions, but not simultaneously.
half duplex
hardware
Physical equipment (director, switch, or personal computer) as
opposed to computer programs or software.
Director or switch Hardware Log. Log displayed through the Element
Hardware Log
Manager application that provides a history of FRU removals and
replacements (insertions) for an individual director or switch. The
information is useful to maintenance personnel for fault isolation and
repair verification. See also
Audit
Log;
Event
Log;
Link Incident
Log;
Threshold Alert
Log.
See
host bus
adapter.
HBA
Hertz
Hz. A unit of frequency equal to one cycle per second.
A fabric containing open-fabric-compliant products from various
heterogeneous fabric
vendors. Contrast with
homogeneous
fabric.
hexadecimal
A numbering system with base of sixteen; valid numbers use the dig-
its 0 through 9 and characters A through F, where A represents 10 and
F represents 15 (D).
high availability
A performance feature characterized by hardware component redun-
dancy and concurrent maintenance. High-availability systems maxi-
mize system uptime while providing superior reliability, availability,
and serviceability.
A fabric consisting of only one vendor's products. Contrast with
heter-
homogeneous fabric
ogeneous
fabric.
hop
(1) Data transfer from one node to another node. (2) Describes the
number of switches that handle a data frame from its origination
point through it's destination point.
hop count
The number of hops a unit of information traverses in a fabric.
host bus adapter
HBA. Logic card that provides a link between the server and storage
subsystem, and that integrates the operating systems and I/O proto-
cols to ensure interoperability.
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SAN32M-1 Installation and Service Manual
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