HP P6000 Continuous Access Implementation Guide (T3680-96431, August 2012)

Glossary
A
ABM array-based management
array Synonymous with storage array, storage system, and virtal array. A group of disks in one or
more disk enclosures connected to two controllers running controller software that presents disk
storage capacity as one or more virtual disks. See also virtual array, storage system.
array-based
management
A management structure in which HP P6000 Command View is installed on the management
module within the EVA controller enclosure.
asynchronous A term used to describe computing models that eliminate timing dependencies between sequential
processes. In asynchronous replication, the array controller acknowledges that data has been
written at the source before the data is copied at the destination. Asynchronous write mode is an
optional DR group property. See also synchronous.
B
bandwidth The transmission capacity of a link or system, usually measured in bits per second (b/s).
bandwidth latency
product
The measurement of the ability to buffer data; the raw transfer speed in bytes/second times the
round-trip latency in seconds.
bidirectional An array that contains both source and destination virtual disks. A bidirectional configuration
allows multidirectional I/O flow among several arrays.
C
controller software Controller software manages all aspects of array operations, including communication with HP
P6000 Command View. VCS is the controller software for the EVA3000/5000 models. XCS is
the controller software for all other EVA array models.
EVA Continuous
Access
A storage-based HP solution consisting of two or more arrays performing disk-to-disk replication,
along with management user interfaces that facilitate configuring, monitoring, and maintaining
the replicating capabilities of the arrays.
D
data currency A measure of how current the last I/O on the DR group destination member is when compared
to the last I/O written to the DR group source member. The time difference between the last I/O
written to the source member and the last I/O written to the destination member represents the
amount of data that would be lost if the source member was no longer available, (assuming a
non-recoverable event at the source site). See also RPO.
DC-Management Dynamic capacity management feature that enables you to extend (increase) or shrink (decrease)
the size of a host volume without disrupting host I/O.
default disk group The disk group created when the array is initialized. The disk group must contain a minimum of
eight disks. The maximum is the number of installed disks.
destination The targeted recipient (for example, array or virtual disk) of replicated data. See also source.
disaster tolerance The capability for rapid recovery of user data from a remote location when a significant event
or disaster occurs at the local computing site. It is a special combination of high-availability
technology and services that can continue the operation of critical applications in the event of a
site disaster. Disaster-tolerant systems are designed to allow applications to continue operating
during the disaster recovery period.The capability for rapid recovery of user data from a remote
location when a significant event or disaster occurs at the local computing site. It is a special
combination of high-availability technology and services that can continue the operation of critical
applications in the event of a site disaster. Disaster-tolerant systems are designed to allow
applications to continue operating during the disaster recovery period.
disk group A named group of disks selected from all available disks in an array. One or more virtual disks
can be created from a disk group.
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