HP StorageWorks HSG80 Array Controller V8.7 Maintenance And Service Manual page 175

• A logical channel in a communications system.
• The hardware and software used to connect a host controller to a communications bus,
such as a SCSI bus or serial bus.
Regarding the controller, the port is:
• The logical route for data in and out of a controller that can contain one or more channels,
all of which contain the same type of data.
• The hardware and software that connects a controller to a SCSI device.
primary enclosure
The primary enclosure is the subsystem enclosure that contains the controllers, cache modules,
external cache batteries, and the PVA module.
program card
The PCMCIA card containing the controller operating software. See also PCMCIA card.
protocol
The conventions or rules for the format and timing of messages sent and received.
PTL
Port-Target-LUN. The controller method of locating a device on the controller device bus.
PVA module
Power Verification and Addressing module.
quiesce
The act of rendering bus activity inactive or dormant. For example, "quiesce the SCSI bus
operations during a device warm swap."
RAID
Redundant array of independent disks. Represents multiple levels of storage access developed
to improve performance or availability, or both.
RAID level 0
A RAID storageset that stripes data across an array of disk drives. A single logical disk spans
multiple physical disks, allowing parallel data processing for increased I/O performance.
While the performance characteristics of RAID level 0 is excellent, this RAID level is the only
one that does not provide redundancy. Raid level 0 storagesets are sometimes referred to as
stripesets.
RAID level 0+1
A RAID storageset that stripes data across an array of disks (RAID level 0) and mirrors the
striped data (RAID level 1) to provide high I/O performance and high availability. Raid level
0+1 storagesets are sometimes referred to as striped mirrorsets.
HSG80 Array Controller V8.7 Maintenance and Service Guide
Glossary
Glossary–9