HP Hitachi Dynamic Link Manager Software - Manual (Page 49)

Figure 2-12 Path Status Transitions (P-VOL in HAM environment)
Legend:
Online operation: Online operation performed by executing the dlnkmgr
command's online operation.
Offline operation: Offline operation performed by executing the dlnkmgr
command's offline operation.
#1
Also when an error occurs in all the paths to an S-VOL in the Online(D)
status.
#2
When I/O operations are processed on an S-VOL.
If there is only one available online path for an LU, it cannot be placed offline
by executing the offline operation. This ensures that the LU can always be
accessed by at least one path. For details on the offline operation, see
offline (Places Paths Offline) on page 6-6 .
If an error occurs in the only available online path for an LU, the status of the
path will change to Online(E).
If you are using the automatic failback function, after the path has recovered
from the error, HDLM will automatically place 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:
HDLM Functions
2-25
Hitachi Dynamic Link Manager User Guide for Linux ®