HP XP P9000 Continuous Access Synchronous for Mainframe Systems User Guide

RAID group A redundant array of inexpensive drives (RAID) that have the same capacity and are treated as
one group for data storage and recovery. A RAID group contains both user data and parity
information, which allows the user data to be accessed in the event that one or more of the drives
within the RAID group are not available. The RAID level of a RAID group determines the number
of data drives and parity drives and how the data is “striped” across the drives. For RAID1, user
data is duplicated within the RAID group, so there is no parity data for RAID1 RAID groups.
A RAID group can also be called an array group or a parity group.
RAID level The type of RAID implementation. RAID levels include RAID 0, RAID 1, RAID 2, RAID 3, RAID 4,
RAID 5 and RAID 6.
RCP remote control port
RCU See remote control unit (RCU).
RCU target port A fibre-channel port that is configured to receive remote I/Os from an initiator port on another
storage system.
RD read
remote console PC A previous term for the personal computer (PC) system that is LAN-connected to a RAID storage
system. The current term is Remote Web Console PC.
remote control port
(RCP)
A serial-channel (ESCON) port on a Cnt Ac-S main control unit (MCU) that is configured to send
remote I/Os to a Cnt Ac-S remote control unit (RCU).
remote control unit
(RCU)
A storage system at a secondary or remote site that is configured to receive remote I/Os from
one or more storage systems at the primary or main site.
remote copy See remote replication.
remote copy
connections
The physical paths that connect a storage system at the primary site to a storage system at the
secondary site. Also called data path.
remote replication Data replication configuration in which the storage system that contains the original data is at a
local site and the storage system that contains the copy of the original data is at a remote site.
Cnt Ac-S and Continuous Access Journal provide remote replication. See also in-system replication.
remote site See secondary site.
remote volume
(R-VOL)
In Cnt Ac-S Z, a volume at the remote or secondary site that contains a copy of the original data
on the main or primary volume at the main or primary site.
restore journal
(R-JNL)
Holds differential data on the secondary Continuous Access Journal system until it is copied to
the secondary volume.
resync “Resync” is short for resynchronize.
RF record format
RIO remote I/O
RL record length
RMI Remote Method Invocation
rnd random
root volume A level-1 primary volume in a Business Copy cascade configuration. The secondary volume of a
layer-1 pair is called a node volume. See also cascade configuration.
RPO recovery point objective
RTC real-time clock
RTO recovery time objective
RWC Remote Web Console
S# serial number
S-VOL See secondary volume or source volume (S-VOL).
S/N serial number
s/w software
SAID system adapter ID
182 Glossary