GLYPH<SM590000> Over provisioned ratio GLYPH<SM590000> Provisioning limit - maximum provisioned capacity - over provisioning limit The ratio of provisioned capacity to usable capacity in the pool or system. In some storage systems, restrictions in the storage hardware or configured by the user  that define a limit the maximum provisioned capacity allowed in a pool or system. Capacity licensing is a licensing model that licenses features with a price-per-terabyte model.  Licensed features are FlashCopy, Metro Mirror, Global Mirror, and virtualization. See also  “FlashCopy” on page 803, “Metro Mirror” on page 807, and “Virtualization” on page 814. A set of enclosures that are attached to provide redundant access to the drives inside the  enclosures. Each control enclosure can have one or more chains. Challenge Handshake Authentication Protocol (CHAP) is an authentication protocol that  protects against eavesdropping by encrypting the user name and password. 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. 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 808. Cloud Container is a virtual object that include all of the elements, components, or data that  are common to a specific application or data. Cloud provider is the company or organization that provide 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 Cloud, Amazon S3, and  deployments of OpenStack Swift. Cloud Tenant is a group or an instance that provides common access with the specific  privileges to an object, software, or data source. A clustered system, which was known as a cluster, is a group of up to eight SVC nodes that  presents a single configuration, management, and service interface to the user. 798  Implementing the IBM System Storage SAN Volume Controller with IBM Spectrum Virtualize V8.2.1 Capacity licensing Chain Challenge Handshake Authentication Protocol Channel extender Child pool Cloud Container Cloud Provider Cloud Tenant Clustered system (SVC)