|
Sector
|
The lowest level that can be addressed on a block device.
|
|
Disk
|
A physical disk or a logical device.
|
|
Segment
|
An ordered set of physically contiguous sectors on a single device. It is similar to traditional disk partitions.
|
|
Region
|
An ordered set of logically contiguous sectors that might or might not be physically contiguous. The underlying mapping can be to logical disks, disk segments, or other storage regions.
|
|
Feature
(Feature Object, EVMS Feature, EVMS Object)
|
A logically contiguous address space created from one or more disks, segments, regions, or other feature objects through the use of an EVMS feature.
|
|
Storage Object
|
Any storage structure in EVMS that is capable of being a block device. Disks, segments, regions, and feature objects are all storage objects.
|
|
Container
(Storage Container)
|
A collection of devices that is managed as a single pool of storage.
Private Storage Container: A storage container that is exclusively owned and accessed by only one server.
Cluster Storage Container: A storage container managed by the Cluster Resource Manager. It is accessible to all nodes of a cluster. An administrator can configure the storage objects in the cluster container from any node in the cluster. Cluster containers can be private, shared, or deported.
Private: The cluster container is exclusively owned and accessed by only one particular node of a cluster at any given time. The ownership can be reassigned by failover policies or the administrator. Shared: The cluster container is concurrently owned and accessed by all nodes of a cluster. Shared containers are preferred for distributed databases, clustered file systems, and cluster-aware applications that can coordinate safe access to shared volumes. Deported: The cluster container is not owned or accessed by any node of the cluster.
|
|
Volume
(Logical Volume)
|
A mountable storage object. Logical volumes can be EVMS volumes or compatibility volumes.
EVMS Volume: Volumes that contain EVMS metadata and support all EVMS features. Device nodes for EVMS volumes are stored in the /dev/evms directory. For example: /dev/evms/my_volume Compatibility Volume: Volumes that are backward-compatible to other volume managers. They do not contain EVMS metadata and cannot support EVMS features.
|
