HP 3PAR T-Class Storage Systems - Manual (Page 464)

3PAR InForm Management Console 4.1.0 User’s Guide
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cache memory page (CMP): A 16-KIB block of control cache memory where I/O requests
are stored.
Cage availability: Creates a virtual volume that can tolerate a drive cage failure because
its RAID sets use chunklets from different drive cages.
child volume: A virtual volume (virtual or physical copy) made from a parent volume.
chunklet: A 256MB block of contiguous space on a physical disk.
clean chunklet: A chunklet to which no data has been written.
cluster: A group of controller nodes connected via the same storage server backplane. The
nodes in a cluster operate as a unified system, separate from any other clusters that
may share the same service processor.
CMP: See cache memory page.
common provisioning group (CPG): A set of logical disks from which you can create
virtual volumes and virtual copies that are capable of allocating storage on demand.
control cache: Memory modules that support the microprocessors located in a controller
node.
controller node: An individual device that works together with other controller nodes to
cache and manage data in a storage server and to provide hosts with a coherent,
virtualized view of the storage.
copy data: Data that occupies the snapshot data space on a virtual volume. See also
snapshot data space.
Copy of RCIP: Remote Copy over IP. The use of 3PAR Remote Copy with two storage
servers that are connected via Ethernet ports. See also 3PAR Remote Copy.
copy size: The size of the snapshot data space in a virtual volume, which is the amount of
logical disk space reserved for snapshots. See also snapshot data space.
CPG template: Common provisioning group template. The template contains a set of
common provisioning group and logical disk parameters that can be applied again
and again to create common provisioning groups with the same characteristics using
the InForm Management Console.
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data cache: The dual in-line memory modules (DIMMs) that support the 3PAR ASIC located
in a controller node.
data space: See snapshot data space.
DC2 drive cage: A storage server component consisting of a drive cage midplane, two
drive cage FCAL modules, four power supplies, and up to 40 physical disks in a
maximum of ten drive magazines.
DC3 drive cage: A storage server component consisting of a drive cage, two drive cage
FCAL modules, two power supplies, and up to 16 physical disks.
DC4 drive cage: A storage server component consisting of a drive cage midplane, two
drive cage FCAL modules, four power supplies, and up to 40 physical disks in a
maximum of ten drive magazines.