Physical Path - Hitachi XP P9500 User Manual

P
path
An access path from a host to a storage system. Access to an area within an LU in a
storage system is made via a cable connecting the HBA on the host and the CHA on the
storage system. This cable is a path. Each path has an AutoPATH_ID.
(See also: AutoPATH_ID)
path health checking
A function for checking the status of paths at regular intervals.
When an error occurs on a path that was in the Online status, path health checking
changes the status of the path to the Offline(E) status.
Path health checking checks only those paths that have the Online status.
path name
The path name consisting of the following four elements, separated by periods:
- Host port number (hexadecimal number)
- Bus number (hexadecimal number)
- Target ID (hexadecimal number)
- Host LU number (hexadecimal number)
A path name is used to identify a physical path.
(See also: host LU number)
physical device file
A device file under /devices.

physical path

An access path from a host to an LU. A path name is used to identify a physical path.
R
reservation
The reservation function enables a host to declare that it has exclusive rights to use a
particular LU, and prevents other hosts from accessing that LU. Access permission for
an LU that has been reserved is given only to the host that issued the reservation, so
the LU cannot be accessed from multiple paths (coming from multiple hosts)
simultaneously. However, because of this, load balancing is not possible.
S
SAN (Storage Area Network)
A high-speed network connecting hosts to storage systems. This network is independent
of a LAN and is dedicated to data transfers. A SAN provides faster access to storage
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