HP XP P9500 Storage - Manual (Page 44)

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 Performing Failovers and
Failbacks Using Path Switching on page 2-18 is further subdivided into two
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 offline (Places
Paths Offline) on page 6-5 .
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 shows the status
transitions of a path.
2-22
HDLM Functions
Hitachi Dynamic Link Manager User Guide (for Linux(R))