HP XP P9500 Storage - Manual (Page 228)

logical partition
(LPAR) A subset of a system’s hardware resources that is virtualized as a separate system. For a storage
system, logical partitioning can be applied to cache memory and/or storage capacity.
logical unit (LU) A logical volume that is configured for use by open-systems hosts (for example, OPEN-V).
logical unit (LU)
path The path between an open-systems host and a logical unit.
logical volume See volume.
logical volume
image (LVI) A logical volume that is configured for use by mainframe hosts (for example, 3390-9).
LU See logical unit
LUN See logical unit number
LUSE HP LUN Expansion; HP LU Size Expansion
LV logical volume
LVI See logical volume image (LVI) .
MF, M/F mainframe
modify mode The mode of operation of Remote Web Console that allows changes to the storage system
configuration. See also view mode.
OPEN-V A logical unit (LU) of user-defined size that is formatted for use by open-systems hosts.
OPEN- x A logical unit (LU) of fixed size (for example, OPEN-3 or OPEN-9) that is used primarily for
sharing data between mainframe and open-systems hosts using Data Exchange.
P-VOL This term is used only in the earlier version of the Remote Web Console GUI (still in use) for the
primary volume. See primary volume (P-VOL) .
pair Two logical volumes in a replication relationship in which one volume contains original data to
be copied and the other volume contains the copy of the original data. The copy operations can
be synchronous or asynchronous, and the pair volumes can be located in the same storage system
(in-system replication) or in different storage systems (remote replication).
parity group See RAID group.
PAV Parallel Access Volume
PCB printed circuit board
PDEV physical device
PG parity group. See RAID group.
physical device See device.
pool A set of volumes that are reserved for storing Snapshot data or Thin Provisioning write data.
pool volume
(pool-VOL) A logical volume that is reserved for storing snapshot data for Snapshot operations or write data
for Thin Provisioning.
port attribute Indicates the type of fibre-channel port: target, RCU target, or initiator.
primary volume
(P-VOL) The volume in a copy pair that contains the original data to be replicated. The data on the P-VOL
is duplicated synchronously or asynchronously on the secondary volume (S-VOL).
The following HP products use the term P-VOL: Fast Snap, Snapshot, Business Copy, Continuous
Access Synchronous, Continuous Access Journal, Continuous Access Journal Z, and External
Storage Access Manager.
See also secondary volume (S-VOL) .
prio priority mode. Used in Cache Residency.
RAID redundant array of independent disks. A disk array in which part of the physical storage space
is used to store user data and parity information, and another part is used to store a duplicate
set of user data and parity information. This redundant configuration prevents data loss in case
a disk drive within the RAID configuration fails, and enables regeneration of user data in the
event that one of the array's member disks or the access path to it fails.
RAID group A set of RAID disks 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. This allows user
228 Glossary