Hitachi Dynamic Link Manager Software Users Guide for Linux

Specify this parameter to output the correspondence between the current
iLUs and HDLM device names to the device name replacement definition
file (/etc/opt/DynamicLinkManager/dlmchname.conf).
The device name definition file is backed up for three generations
(including the current device name definition file).
Important
• If you execute the dlmchname utility without specifying any parameters,
initial values (0) are set for all statistics (number of I/Os and number of
I/O errors) managed by HDLM.
• If the -f parameter is not specified, the name of an HDLM device that is
being used cannot be changed.
• For disks, such as system disks, that cannot be placed in offline during
system operation, execute the HDLM device name replacement utility with
the -f parameter specified, and then restart the host to change the
name.
If an HDLM device name is changed with the -f parameter specified, the
following restrictions are applied until the host restarts:
¢
An error occurs if the dlmcfgmgr utility is executed.
¢
The HDLM device name before the change is used in I/Os.
• When changing the name of an HDLM device that is a member of an LVM
volume group, execute the dlmchname utility, and then the vgscan
command.
• You cannot execute the dlmchname utility on HDLM devices that are not
configured.
Editing the Device Name Replacement Definition File
This subsection explains how to edit the device name replacement definition
file (/etc/opt/DynamicLinkManager/dlmchname.conf).
How to Edit the Device Name Replacement Definition File
Keep the following in mind when you edit the device name replacement
definition file:
• Specify a storage system serial number, an iLU, and an HDLM device
name on one line, separating each one with a space.
• To enter a comment line, specify a hash mark (#) at the beginning of the
line.
Items to Be Defined in the Device Name Replacement Definition File
In the device name replacement definition file, the correspondence among
storage system serial numbers, iLUs, and HDLM device names is defined.
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Utility Reference
Hitachi Dynamic Link Manager (for Linux®) User Guide