HP XP7 PA Software Installation Guide

Glossary
A
Array Control
Processor (ACP)
ACP is used in the XP disk arrays prior to the XP24000 Disk Array. With the introduction of the
XP24000 Disk Array, the DKA has replaced ACP. The DKA is also applicable for the XP7 disk
arrays.
ACP handles the transfer of data between the cache and the physical drives held in the DKUs.
The ACPs work in pairs, providing a total of eight SCSI buses. Each SCSI bus associated with
one ACP is paired with a SCSI bus on the other ACP pair element. In the event of an ACP failure,
the redundant ACP takes control. Both the ACPs work together by sharing the load. On the XP
models, such as the XP10000 Disk Array, this function is handled by the DKA on the MIX board.
C
Cache A Cache is a high speed memory that is used to speed up the I/O transaction time. All reads
and writes to the XP and P9500 disk arrays are sent to the cache. The data is buffered in the
cache until it is transferred to the physical disks or from the physical disks (with slower data
throughput) is complete. The benefit of cache memory is that it speeds the I/Os throughput to the
application. The larger the cache size, the greater the amount of data buffering that can occur
and the greater throughput to the applications. In the event of power loss, the battery power
maintains the contents of cache for a specified time period.
Cache Logical
Partition (CLPR)
The cache logical partition contains cache and parity groups. It is available on the XP7 disk
arrays, such as the P9500 Disk Array. It is also available on the XP12000, XP10000, and later
generations of the XP and XP7 disk arrays.
NOTE: CLPR0 always exists (cannot be deleted) and is a pool area for cache and parity groups
that are not yet assigned to other CLPRs.
CHA Channel adapter. A device that provides the interface between the array and the external host
system. Occasionally, this term is used synonymously with the term channel host interface processor
(CHIP).
CHIP Channel host interface processor. Synonymous with the term CHA.
CHP Channel processor. The processors located on the CHA. Synonymous with CHIP.
Command Line
User Interface
(CLUI)
In addition to its GUI, HP XP7 Performance Advisor also provides a command-line utility called
the CLUI to monitor real-time performance of the XP and the XP7 disk arrays. The CLUI allows
you to monitor performance, set alarms, and configure host information using commands and
scripts. You can execute commands in the CLUI and view the same data that is displayed on the
GUI. The CLUI utility is operating system specific and can be installed locally on the management
station, or remotely on a client system.
Command View
(CV)
Replaced by the Command View Advanced Edition Suite Software.
Command View AE
(CV AE)
The Command View Advanced Edition Suite Software replaces the XP Command View Software
to manage the XP, P9500 and XP7 disk arrays.
Continuous Access
Journal (Cnt Ac-J)
The Continuous Access Journal Software is an asynchronous mirroring program similar to the
Continuous Access Asynchronous, except that the transactions to be written to the secondary disk
array are maintained in a disk-based journal file. This provides better performance for the
secondary disk array systems that are not highly available or that may be subject to bandwidth
contention from other applications.
Continuous Access
Synchronous (Cnt
Ac-S)
The Continuous Access Synchronous Software provides remote replication between the disk arrays
that belong to the XP7 and the XP families.
CSV Comma-separated value.
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