Specifications

GL–17

Compaq HSG80 Array Controller ACS Version 8.4 Configuration and CLI Reference Guide

protocol The conventions or rules for the format and timing of messages sent and received.

PTL Port-Target-LUN. The controller’s method of locating a device on the controller’s

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. This RAID level is alternatively called a striped mirrorset. Raid level

0+1 storagesets are sometimes referred to as striped mirrorsets.

RAID level 1 A RAID storageset of two or more physical disks that maintains 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’s 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.