Hitachi Dynamic Link Manager Software Users Guide for Windows (7.6)

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.

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).

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:

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HDLM Functions

Hitachi Dynamic Link Manager User Guide for Windows