Path Status Transition - Hitachi XP P9500 User Manual

Executing the online operation places the offline path online. For details on the
operation, see 6.5 online (Places Paths Online). After a path status is
online
changed to online, the path can be selected as a useable path by HDLM in the same
manner as automatic path switching. When using the Thunder 9500V series, or Hitachi
AMS/WMS series, HDLM selects the path to use from online owner paths, and then
from online non-owner paths. When the Lightning 9900 series, Lightning 9900V
series, Hitachi USP, Universal Storage Platform V/VM, Virtual Storage Platform,
Hitachi AMS2000 series, or Hitachi SMS is being used, since all the paths are owner
paths, the path to use is not switched even if you change the path status to online by
using the
online

2.8.3 Path Status Transition

Each of the online and offline statuses described in 2.8 Performing Failovers and
Failbacks Using Path Switching is further subdivided into two statuses. The following
explains the two online path statuses and the two offline statuses.
(1) The Online Path Status
The online path statuses are as follows:
•
Online
I/Os can be issued normally.
•
Online(E)
An error has occurred on the path, but none of the other paths that access the same
LU are in the
If none of the paths accessing a particular LU are in the
paths is changed to the
accessed through at least one path.
The (E) means error, which indicates that an error has occurred on the path from
some previous operation.
(2) The Offline Path Status
The offline path statuses are as follows:
•
Offline(C)
The status in which I/O cannot be issued because the
executed. For details on the
Offline).
The (C) indicates the command attribute, which indicates that the path was placed
offline by using the command.
•
Offline(E)
operation.
status.
Online
status. This ensures that the LU can be
Online(E)
offline
Online
offline
operation, see 6.4 offline (Places Paths
2. HDLM Functions
status, one of the
operation was
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