HP Hitachi Dynamic Link Manager Software - Manual (Page 366)

Replacing the Fibre Channel Switch
If there are multiple online paths for a device in an LU, you can replace a
desired Fibre Channel switch while running your applications by placing offline
only the path that goes through the Fibre Channel switch to be replaced, and
using other paths to continue accesses.
The following steps show an example procedure for replacing a Fibre Channel
switch. Note that this procedure only applies for replacing a Fibre Channel
switch.
This example assumes the system configuration as below:
Figure 4-4 System Configuration for Replacing a Fibre Channel Switch
(Explained in the Following Steps)
To replace the Fibre Channel switch:
1
.
Place in Offline (C) status the path that goes through the Fibre Channel
switch to be replaced (path that goes through the HBA to which the Fibre
Channel switch is connected).
For example, to place in Offline (C) status the path that goes through the
HBA with host port number 0001 and bus number 0000, execute the
following command:
# /opt/DynamicLinkManager/bin/dlnkmgr offline -hba 0001.0000
While the path that goes through the HBA with host port number 0001 is
placed Offline, the status of the path that goes through the HBA with host
port number 0002 is Online.
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HDLM Operation
Hitachi Dynamic Link Manager User Guide for Linux ®