Path Status Transition; The Online Path Status; The Offline Path Status; Status Transitions Of A Path - Hitachi XP P9500 User Manual

use is not switched even if you change the path status to online by using the
online operation.

Path Status Transition

Each of the online and offline statuses described in
Failbacks Using Path Switching on page 2-18
statuses. The following explains the two online path statuses and the two
offline statuses.

The Online Path Status

The online path statuses are as follows:
•
Online
I/Os can be issued normally.
•
Online(E)
An error has occurred on the path, but none of the other paths that
access the same LU are in the Online status.
If none of the paths accessing a particular LU are in the Online status,
one of the paths is changed to the Online(E) status. This ensures that
the LU can be accessed through at least one path.
The (E) means error, which indicates that an error has occurred on the
path from some previous operation.

The Offline Path Status

The offline path statuses are as follows:
•
Offline(C)
The status in which I/O cannot be issued because the offline operation
was executed. For details on the offline operation, see
Paths Offline) on page
The (C) indicates the command attribute, which indicates that the path
was placed offline by using the command.
•
Offline(E)
The status indicating that an I/O could not be issued on a given path,
because an error occurred on the path.
The (E) means error.

Status Transitions of a Path

Figure 2-11 Path Status Transitions on page 2-23
transitions of a path.
2-22
6-5.
HDLM Functions
Hitachi Dynamic Link Manager User Guide (for Linux(R))
Performing Failovers and
is further subdivided into two
offline (Places
shows the status