Hitachi Dynamic Link Manager Software Users Guide for Linux

Changing the HDLM Device Configuration
This section describes the actions and procedures to change the HDLM device
configuration.
To set up or change (add, change or delete) an LU in a storage system, use
the management program of the storage system, rather than the HDLM
functionality. For more information on configuring or changing an LU, see the
manual provided with the storage system.
All the actions performed via the HDLM-configuration definition utility
(dlmcfgmgr) are logged in the /var/opt/DynamicLinkManager/log/
dlmcfgmgr1.log file. By looking in this file, you can examine the change(s)
made to the configuration, or the reason why the execution of the dlmcfgmgr
utility failed. For more information on the dlmcfgmgr utility log, see also
Types of Collected Logs on page 2-33. For more information on the
dlmcfgmgr utility, see dlmcfgmgr Utility for Managing the HDLM Configuration
on page 7-22.
Notes on Changing the HDLM Device Configuration
Note the following when changing the HDLM device configuration:
• When an HDLM device is excluded from HDLM management, the
AutoPATH_IDs assigned to the paths for that device will be released.
Because of this, after paths for an HDLM device are released, the
AutoPATH_IDs of the paths may be displayed in a non-consecutive
sequence.
• When an HDLM device is included in HDLM management, HDLM assigns
an AutoPATH_ID in sequential order (from the lowest available number) to
the path of that HDLM device.
• When an HDLM device that is not managed by HDLM is included in HDLM
management, HDLM places online all the normal paths to that HDLM
device regardless of the previous status (such as Online(E) or
Offline(C)) of the path.
• Do not execute the HDLM-configuration definition utility (dlmcfgmgr) with
the -o, -i, or -u parameter while the LU is in use (for example, when
performing I/O or a mount).
• If a disk partition is created or changed while some of the paths for an LU
are disconnected, the disk partition may not be recognized even after the
disconnected paths have been recovered. After connecting the
disconnected paths, execute the dlmcfgmgr utility or restart the host.
• When the dlmcfgmgr utility is executed to change the HDLM device
configuration, memory might become insufficient due to the HAL
daemon
#
. In this case, the host will not respond.
To avoid this, stop the HAL daemon when executing the dlmcfgmgr utility.
For details on how to stop the HAL daemon, see
Notes on Installing HDLM
on page 3-99.
#
HDLM Operation
4-57
Hitachi Dynamic Link Manager (for Linux®) User Guide