HP XP7 User Manual page 329

capacity The amount of data storage space available on a physical storage device, usually measured in
bytes (MB, GB, TB, etc.).
CC Concurrent Copy; channel command; cylinder-cylinder
CFW cache fast write
CG See consistency group (CTG).
CLI command line interface
CLPR See cache logical partition.
cluster Multiple-storage servers working together to respond to multiple read and write requests.
command device A dedicated logical volume used only by RAID Manager to interface with the storage system.
Can be shared by several hosts.
concatenated A configuration where the VDEVs corresponding to a pair of RAID 10 (2D+2D) or RAID 5 (7D+1P)
parity group parity groups, or four RAID 5 (7D+1P) parity groups, are interleaved on a RAID stripe level on
a round-robin basis. A logical RAID stripe line is created as a concatenation of the individual
RAID stripe lines. This has the effect of dispersing I/O activity over twice or four times the number
of disks, but it does not change the number, names, or size of VDEVs, and hence it doesn't make
it possible to assign larger LDEVs to them. Note that we often refer to RAID 10 (4D+4D), but this
is actually two RAID 10 (2D+2D) parity groups interleaved together.
configuration A text file that defines the configuration, parameters, and options of RAID Manager (RAID
definition file Manager) operations. It also defines the connected hosts and the volumes and groups known to
the RAID Manager instance.
consistency group A group of pairs on which copy operations are performed simultaneously; the pairs' status changes
(CG, CTG) at the same time. See also extended consistency group (EXCTG).
consistency time Shows a time stamp to indicate how close the target volume is to the source volume. C/T also
(C/T) shows the time stamp of a journal group and extended consistency group.
controller The component in a storage system that manages all storage functions. It is analogous to a
computer and contains a processors, I/O devices, RAM, power supplies, cooling fans, and other
sub-components as needed to support the operation of the storage system.
controller chassis The hardware component that houses the controller components of the HP XP7 Storage , including
the front-end directors, virtual storage directors, cache and shared memory, switches, and back-end
directors. The HP XP7 Storage can be configured with one or two controller chassis.
copy pair A pair of volumes in which one volume contains original data and the other volume contains the
copy of the original. Copy operations can be synchronous or asynchronous, and the volumes of
the copy pair can be located in the same storage system (local copy) or in different storage
systems (remote copy).
A copy pair can also be called a volume pair, or just pair.
CR Cache Residency Manager
CT, C/T See consistency time (C/T).
CTG See consistency group (CTG).
CU control unit
custom volume A customized (variable-sized) volume whose size is defined by the user using Virtual LVI/Virtual
(CV) LUN.
CV See custom volume (CV).
CVS custom volume size
CYL, cyl cylinder
data drive A physical data storage device that can be a hard disk drive (HDD), flash drive (also called a
solid-state device), or a flash module drive (FMD).
data path The physical paths used by primary storage systems to communicate with secondary storage
systems in a remote replication environment.
data pool One or more logical volumes designated to temporarily store original data. When a snapshot is
taken of a primary volume, the data pool is used if a data block in the primary volume is to be
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