HP XP7 Storage - Manual (Page 44)

When the following conditions are all satisfied, a path that has been
determined to have an intermittent error also becomes subject to
automatic failback:
¢
All the paths connected to an LU are Online(E), Offline(E), or
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.
#5
During reserve processing for an LU, the Offline(E) status is temporarily
changed to Offline(P). After the reserve processing finishes, the
Offline(P) status is changed to Offline(C).
#6
When the following conditions are satisfied, the connected Offline(E)
paths are automatically placed online:
¢
All the online paths are Online(E) and all the SCSI devices connected
to the Online(E) paths have been deleted.
¢
The Offline(E) paths are assumed to have had an intermittent error,
and are thus excluded from automatic failbacks.
¢
The SCSI devices are connected to the Offline(E) paths.
Figure 2-12 Path Status Transitions (P-VOL in HAM environment)
Legend:
2-24
HDLM Functions
Hitachi Dynamic Link Manager (for Windows®) User Guide