HP StorageWorks Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide (AA-RPHZF-TE, March 2004)

Glossary
243Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide
heterogeneous host support
Also called noncooperating host support. The ability to share storage between two similar (or dissimilar) hosts
by way of storage partitioning.
HIPPI–FC
An acronym for the high-performance parallel interface (HIPPI) over the Fibre Channel. HIPPI is a media-level,
point-to-point, 12-channel, full-duplex, electrical/optical interface. Not supported by DRM. See
http://www.t11.org
for more information.
hop
The definition of an interswitch connection. For example, there is one hop between two cascaded switches.
ISL
Intersite link or interswitch link. The abbreviation is context sensitive.
See also multiple intersite links.
initiator
1. A SCSI device that requests an I/O process to be performed by another SCSI device, namely, the SCSI
target. The controller is the initiator on the device bus.
2. For subsystems using the disaster tolerant Data Replication Manager solution, the initiator is the site that is
the primary source of information. In the event of a system outage, the data would be recovered from the
target system.
See also target.
IP address
An abbreviation for Internet Protocol Address. The IP address is a number that is used as the address specifying
a particular computer connected to the Internet.
L_port
A node or fabric port capable of performing arbitrated loop functions and protocols. NL_port and FL_Port are
loop-capable ports.
latency
The amount of time required for a transmission to reach its destination.
LBN
An acronym for logical block number.
See logical block number.
link
A physical connection between two adjacent Fibre Channel ports, consisting of a transmit fiber and a receive
fiber. An example would be the connection between the Fibre Channel switch port and the HSG80 controller.
See also connection.
local terminal
A terminal plugged into the EIA-423 maintenance port on the front bezel of the HS array controller. Also called
a maintenance terminal.
Logical block number
A volume-relative address of a block on a mass storage device. The blocks that form the volume are labeled
sequentially starting with LBN 0.
logical unit
A physical or virtual device addressable through a target ID number. The logical unit numbers (LUNs) use their
target’s bus connection to communicate on the SCSI bus.
See logical unit number.