Novell LINUX ENTERPRISE SERVER 10 - STORAGE ADMINISTRATION GUIDE FOR EVMS Administration Manual

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Novell LINUX ENTERPRISE SERVER 10 - STORAGE ADMINISTRATION GUIDE FOR EVMS Administration Manual Manual pdf 13 page image

Overview of EVMS 13novdocx (ENU) 9 January 20071.5 Location of Device Nodes for EVMS StorageObjectsEVMS creates a unified namespace for the logical volumes on your system in the /dev/evmsdirectory. It detects the storage objects actually present on a system, and creates an appropriatedevice node for each one, such as those shown in the following table.Table 1-3 Device Node LocationRegion An ordered set of logically contiguous sectors that might or might not bephysically contiguous. The underlying mapping can be to logical disks, disksegments, or other storage regions.Feature(Feature Object, EVMSFeature, EVMS Object)A logically contiguous address space created from one or more disks,segments, regions, or other feature objects through the use of an EVMSfeature.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 are managed as a single pool of storage.Private Storage Container: A storage container that is exclusively owned andaccessed by only one server.Cluster Storage Container: A storage container managed by the ClusterResource Manager. It is accessible to all nodes of a cluster. An administratorcan configure the storage objects in the cluster container from any node in thecluster. Cluster containers can be private, shared, or deported. Private: The cluster container is exclusively owned and accessed by onlyone particular node of a cluster at any given time. The ownership can bereassigned by fail-over policies or the administrator. Shared: The cluster container is concurrently owned and accessed by allnodes of a cluster. Shared containers are preferred for distributeddatabases, clustered file systems, and cluster-aware applications that cancoordinate safe access to shared volumes. Deported: The cluster container is not owned or accessed by any node ofthe cluster.Volume(Logical Volume)A mountable storage object. Logical volumes can be EVMS volumes orcompatibility volumes. EVMS Volume: Volumes that contain EVMS metadata and support allEVMS features. Device nodes for EVMS volumes are stored in the /dev/evms directory. For example: /dev/evms/my_volume Compatibility Volume: Volumes that are backwards-compatible to othervolume managers. They do not contain EVMS metadata and cannotsupport EVMS features.Storage Object Standard Location the Device Node EVMS Location of the Device NodeA disk segment of disk /dev/sda5 /dev/evms/sda5Term Description