Glossary - IBM 2145-8F4 Installation Manual

Glossary

Ensure you are familiar with the list of terms and their definitions used in this
guide.
A
asymmetric virtualization
C
cache
CIM
cluster
Common Information Model (CIM)
D
degraded
directed maintenance procedures
disk zone
E
error code
excluded
© Copyright IBM Corp. 2003, 2006
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 while the storage devices
contain only data. See also symmetric virtualization.
A high-speed memory or storage device used to reduce the effective time
required to read data from or write data to lower-speed memory or a
device. Read cache holds data in anticipation that it will be requested by a
client. Write cache holds data written by a client until it can be safely
stored on more permanent storage media such as disk or tape.
See Common Information Model.
In SAN Volume Controller, a pair of nodes that provides a single
configuration and service interface.
A set of standards developed by the Distributed Management Task Force
(DMTF). CIM provides a conceptual framework for storage management
and an open approach to the design and implementation of storage
systems, applications, databases, networks, and devices.
Pertaining to a valid configuration that has suffered a failure but continues
to be supported and legal. Typically, a repair action can be performed on a
degraded configuration to restore it to a valid configuration.
The set of maintenance procedures that can be run for a cluster. These
procedures are run from within the SAN Volume Controller application
and are documented in the service guide.
A zone defined in the storage area network (SAN) fabric in which the SAN
Volume Controller can detect and address the logical units that the disk
controllers present.
A value that identifies an error condition.
In SAN Volume Controller, the status of a managed disk that the cluster
has removed from use after repeated access errors.
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