Adding A New Logical Unit; Notes - Hitachi XP P9500 User Manual

new LUs, execute the dlmsetconf utility, and then execute the dlmcfgmgr
utility for managing the HDLM configuration.
• Without restarting the system, when you add a new path to the LU that
HDLM manages, the logical device file of the sd or ssd device
corresponding to the path will not be created. When you want to use the
newly added path in HDLM, execute the dlmsetconf utility and then
restart the host, with the reconfiguration option specified.
• In Solaris 10, you can delete HDLM devices without restarting the host.
However, if you cannot stop all of the programs that are using the HDLM
devices that you want to delete or you cannot remove the mapping
between the internal LUs and the storage port LUNs by performing
operations on the storage system, you must restart the host to delete the
HDLM devices.

Adding a New Logical Unit

This section describes the operations for configuring a new LU recognized by
the host, as an HDLM-managed device.
In a Solaris 8 version1/01 or later, Solaris 9, or Solaris 10 environment that
supports dynamic reconfiguration of HDLM devices, you can modify settings
so that new LUs are recognized automatically by the HDLM driver without
restarting the host. In this case, you need to use the dlmcfgmgr utility for
managing the HDLM configuration in order to have the HDLM driver recognize
the contents of the HDLM driver configuration definition file (/kernel/drv/
dlmfdrv.conf) without having to restart the host. For details on the
dlmcfgmgr utility, see
Configuration on page

Notes

The following describes the notes on adding new LUs:
• If you do not want to configure an LU that was newly added to the host,
as an HDLM managed device, first set the LU as a non-HDLM-managed
device, and then execute the dlmcfgmgr utility. If the newly added LU is
set as a non-HDLM-managed device, reconfiguration of the LU for the
HDLM driver will not be performed.
• You cannot perform dynamic reconfiguration when you add a new LU to
HDLM and an existing instance number is allocated to the path of the LU.
In such a case, restart the host.
• If the major and minor numbers of the sd or ssd device of an LU to be
newly added to HDLM matches the major or minor number of an sd or ssd
device previously registered in HDLM, dynamic reconfiguration cannot be
performed. You must restart the host.
• Dynamic reconfiguration cannot be performed when using VxVM, because
the host must be restarted in order to use (in VxVM) an LU that has been
newly added to HDLM.
4-22
The dlmcfgmgr Utility for Managing the HDLM
7-15.
HDLM Operation
Hitachi Dynamic Link Manager User Guide (for Solaris(R))