HP StorageWorks HSG80 ACS Solution Software V8.8 for HP-UX Installation and Configuration Guide (AA-RV1FA-TE, March 2005)

Glossary
253HSG80 ACS Solution Software V8.8 for HP-UX Installation and Configuration Guide
private NL_Port An NL_Port which does not attempt login with the fabric and only
communicates with NL_Ports on the same loop.
program card The PCMCIA card containing the controller operating software.
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, enabling 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. This RAID level is alternatively
called a striped mirrorset.
RAID level 1 A RAID storageset of two or more physical disks that maintain a
complete and independent copy of the entire virtual disk's data. This
type of storageset has the advantage of being highly reliable and
extremely tolerant of device failure. Raid level 1 storagesets are
sometimes referred to as mirrorsets.
RAID level 3 A RAID storageset that transfers data parallel across the array disk
drives a byte at a time, causing individual blocks of data to be spread
over several disks serving as one enormous virtual disk. A separate
redundant check disk for the entire array stores parity on a dedicated
disk drive within the storageset. See also RAID level 5.
RAID level 5 A RAID storageset that, unlike RAID level 3, stores the parity
information across all of the disk drives within the storageset. See also
RAID level 3.