Appendix B. Terminology 821
Challenge Handshake Authentication Protocol
Challenge Handshake Authentication Protocol (CHAP) is an authentication protocol that
protects against eavesdropping by encrypting the user name and password.
Channel extender
A channel extender is a device that is used for long-distance communication that connects
other storage area network (SAN) fabric components. Generally, channel extenders can
involve protocol conversion to asynchronous transfer mode (ATM), Internet Protocol (IP), or
another long-distance communication protocol.
Child pool
Administrators can use child pools to control capacity allocation for volumes that are used for
specific purposes. Rather than being created directly from managed disks (MDisks), child
pools are created from existing capacity that is allocated to a parent pool. As with parent
pools, volumes can be created that specifically use the capacity that is allocated to the child
pool. Child pools are similar to parent pools with similar properties. Child pools can be used
for volume copy operation. Also, see “Parent pool” on page 829.
Cloud Container
Cloud Container is a virtual object that includes all of the elements, components or data that
are common to a specific application or data.
Cloud Service Provider
Cloud Service Provider (CSP) is the company or organization that provides off- and
on-premises cloud services such as storage, server, network, and so on. IBM Spectrum
Virtualize has built in software capabilities to interact with Cloud Providers such as IBM
SoftLayer®, Amazon S3 and deployments of OpenStack Swift.
Cloud Tenant
Cloud Tenant is a group or an instance that provides common access with the specific
privileges to a object, software or data source.
Clustered system (Storwize V5000)
A clustered system, formerly known as a cluster, is a group of up to four IBM Storwize V5000
canisters (two in each system) that presents a single configuration, management, and service
interface to the user.
Cold extent
A cold extent is an extent of a volume that does not get any performance benefit if it is moved
from a hard disk drive (HDD) to a Flash disk. A cold extent also refers to an extent that needs
to be migrated onto an HDD if it is on a Flash disk drive.
Compression
Compression is a function that removes repetitive characters, spaces, strings of characters,
or binary data from the data that is being processed and replaces characters with control
characters. Compression reduces the amount of storage space that is required for data. See
also “RACE engine” on page 830.
Compression accelerator
A compression accelerator is hardware onto which the work of compression is off-loaded
from the microprocessor.
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