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)
persistent reservation
Similar to reservations, persistent reservations enable a server to declare that it has
exclusive rights to use an LU, and prevents other servers from accessing that LU. Note,
however, that while reservations allows a server to have exclusive use of only one path
to the LU, persistent reservations allow a server to have exclusive rights to use multiple
paths.
If persistent reservations are used in HDLM, a host can have exclusive use of multiple
paths to an LU, so that load balancing among these paths is possible.
(See also: reservation)

physical path

An access path from a host to an LU. A path name is used to identify a physical path.
Q
QEMU
A virtual emulator available for the entire host system.
(See also: KVM)
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Hitachi Dynamic Link Manager User Guide (for Linux(R))
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