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Storage Overview and Terminology
The HP NAS 8000 SAN is an easy-to-manage storage solution for heterogeneous
environments including Windows, UNIX, and Linux.
The storage space on the HP NAS 8000 SAN is made up of physical and logical storage:
I Physical storage refers to the hardware used for data storage.
I Logical storage is created by software that organizes physical storage into file volumes and
directories that are made accessible to users.
Physical Storage
The HP NAS 8000 SAN configurations can manage storage on a variety of devices, including
the HP Virtual Array 7100, HP Virtual Array 7400 series, and HP XP series disk arrays using
SecureManager VA or SecureManager XP.
Logical Storage
SAN
A SAN, or Storage Area Network, is a high-speed special-purpose network (or subnetwork)
that connects different kinds of storage devices with associated data servers on behalf of a
larger network of users. Typically, a SAN is part of the overall network of computing
resourcesin a company. SAN devices are usually close to other computing resources, but may
also extend to remote locations for backup and archival storage.
Logical Unit Number
A logical unit number (LUN) is a logical aggregation of space on physical drives. LUNs are
unique identifiers that enable the controller to differentiate between separate devices (each of
which is a logical unit). Each LUN is a unique number that identifies a specific unit of storage.
The HP NAS 8000 SAN supports up to 127 LUNs.
Volume Groups
A volume group is the aggregation of one or more LUNs. Volume groups combine the space
from LUNs and make the space accessible to the file system for creating file volumes and
directories, which can then be made accessible to users.
File Volumes
A volume group is divided into one or more file volumes. File volumes are the basic unit of
logical storage for a file system on the HP NAS 8000 SAN. File volumes can be further
subdivided into individual directories.
Directories
Directories let you organize information. Directories contain files or other persistent data
structures in a file system that contains information about other files. Directories are usually
organized hierarchically and may contain both files and other directories, and are used to
organize collections of files for applications or convenience.
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Network and Storage Planning
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