Hitachi Dynamic Link Manager Software Users Guide for AIX (6.6) (T5208-96010, April 2011)

2. HDLM Functions
31
Offline(C).
• All the paths connected to an LU have been determined to have an
intermittent error.
• The processing of continuous I/O operations issued to an LU is successful.
#3
This path is deleted when the AIX
chdev command is executed on an hdisk
where an
Online or Offline(E) path exists. To restore the deleted path,
remove the cause of the error and then execute the AIX
mkdev -l hdisk-name
or
cfgmgr command.
#4
When an
Online or Offline(E) path exists among the paths that access the
same LU.
#5
One of the
Offline(E) paths is changed to the Online(E) path.
#6
When an
Offline(E) path exists among the paths that access the same LU.
The last available online path for each LU cannot be placed offline by executing the
offline operation. This ensures access to the LU. For details on the offline
operation, see 6.4 offline (Places Paths Offline).
If an error occurs in the last available online path for each LU, the status of the path is
changed to
Online(E).
If you are using automatic failback, when the path recovers from an error, HDLM
automatically places the path online.
When you are using intermittent error monitoring, the path in which the intermittent
error occurred is not automatically placed online when the path recovers from the error.
In such a case, place the path online manually.
Note
If there is a path failure immediately after a path is taken offline by using either
the an HDLM command, the status might change from
Offline(C) to
Offline(E). If an offline operation was just performed, wait about 2 minutes,
check the path status by using an HDLM command, and then make sure that the
status has changed to
Offline(C). If it is still Offline(E), retry the offline
operation.