820 Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
Commonly encountered terms
This book uses the common IBM Spectrum Virtualize and IBM Storwize V5000 terminology
listed in this section.
Array
An ordered collection, or group, of physical devices (disk drive modules) that are used to
define logical volumes or devices. An array is a group of drives designated to be managed
with a Redundant Array of Independent Disks (RAID).
Asymmetric virtualization
Asymmetric virtualization is a virtualization technique in which the virtualization engine is
outside the data path and performs a metadata-style service. The metadata server contains
all the mapping and locking tables, and the storage devices contain only data. See also
“Symmetric virtualization” on page 834
Asynchronous replication
Asynchronous replication is a type of replication in which control is given back to the
application as soon as the write operation is made to the source volume. Later, the write
operation is made to the target volume. See also “Synchronous replication” on page 834.
Automatic data placement mode
Automatic data placement mode is an Easy Tier operating mode in which the host activity on
all the volume extents in a pool are “measured,” a migration plan is created, and then
automatic extent migration is performed.
Back end
See “Front end and back end” on page 825.
Caching I/O Group
The caching I/O Group is the I/O Group in the system that performs the cache function for a
volume.
Call home
Call home is a communication link that is established between a product and a service
provider. The product can use this link to call IBM or another service provider when the
product requires service. With access to the machine, service personnel can perform service
tasks, such as viewing error and problem logs or initiating trace and dump retrievals.
Canister
A canister is a single processing unit within a storage system.
Capacity licensing
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 825, “Metro Mirror” on page 829, and “Virtualization” on page 835.
Chain
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.
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