HP Hitachi Dynamic Link Manager Software - Manual (Page 41)

The (E) means error, which indicates that an error has occurred on the
path from some previous operation.
• Online(EP)
The status of an Offline(P) path changes to Online(EP) when the path
goes through the following process during reserve processing in a cluster
configuration:
a
.
When exactly two paths are connected to an LU and the user performs
an offline operation on the Offline(E) path to change it to
Offline(P) and the other path is Online(E).
b
.
When one path is Offline(P), the other path must be Online(E). If
HDLM detects an error in the Online(E) path, then the path statuses
will change as follows:
The Online(E) path changes to Offline(E).
The Offline(P) path changes to Online(EP).
If the reserve processing finishes after the path has changed from
Online(EP) to Offline(P), the offline operation will end successfully and
the path will change to Offline(C).
If the reserve processing finishes while the path is Online(EP), the offline
operation will fail and the path will change to Online(E).
The Offline Path Statuses
The offline path statuses are as follows:
• Offline(C)
The path is offline because an offline operation was performed.
The (C) means command, which indicates that the path was placed offline
by using the GUI or a 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.
• Offline(P)
This status occurs in a cluster configuration only.
The Offline(P) status indicates that the user has requested an offline
operation on an Offline(E) path that is connected to an LU that is
currently performing reserve processing. After the reserve processing
finishes, the offline operation request will be performed and the path
status will become Offline(C).
The (P) means pending, which indicates that the operation to take the
path offline is in the waiting-to-execute status (i.e. a request has been
made).
Status Transitions of a Path
Figure 2-11 Path Status Transitions on page 2-22 shows the status
transitions of a path.
HDLM Functions
2-21
Hitachi Dynamic Link Manager User Guide (for Windows(R))