HP Hitachi Dynamic Link Manager Software - Manual (Page 35)

then from online non-owner paths. When the Universal Storage Platform V/
VM series, Virtual Storage Platform series, Hitachi AMS2000 series
# , Hitachi
SMS series # , or HUS100 series # is being used, because all the paths are
owner paths, the path to use is not switched even if you change the path
status to online.
#
This storage system applies when the dynamic I/O path control function is
disabled.
Path Status Transition
Each of the online and offline statuses described in Performing Failovers and
Failbacks Using Path Switching on page 2-13 is further subdivided into
several statuses. The path statuses (the online path statuses and offline path
statuses) are explained below.
The Online Path Statuses
The online path statuses are as follows:
• Online
I/Os can be issued normally.
•
Online(S) #
The paths to the primary volume (P-VOL) in the HAM environment have
recovered from an error, but I/O to the P-VOL is suppressed.
•
Online(D) #
The paths to the primary volume (P-VOL) in an HAM environment have
recovered from an error, but I/O to the P-VOL is suppressed. If an error
occurs in all the paths to a secondary volume (S-VOL), the status of the
P-VOL paths will be automatically changed to the Online status. To
change the status to the Online(D) status, specify the -dfha parameter
for the HDLM command's online operation.
#
The status changes to this status when using HAM (High Availability
Manager).
The Offline Path Statuses
The offline path statuses are as follows:
• Offline(C)
The status in which I/O cannot be issued because the offline operation
was executed. For details on the offline operation, see offline (Places
Paths Offline) on page 6-7 .
The (C) indicates the command attribute, which indicates that the path
was placed offline by using the command.
• Offline(E)
HDLM Functions
2-17
Hitachi Dynamic Link Manager User Guide for VMware ®