Hitachi Dynamic Link Manager Software Users Guide for Linux

HDLM command to display the path status, the target ID of the path
before the change might be displayed. In addition, the HDLM device
name might be changed after the host is restarted. Check the HDLM
device name after the host is restarted. If the HDLM device name has
been changed, reconfigure the higher-level program.
However, you can avoid the above situations by setting a permanent
target ID for each LU with the HBA driver persistent binding functionality.
For details on whether the persistent binding functionality is supported for
your HBA driver and the setting method, see the manual provided with
the HBA driver.
Notes on Linux
• HDLM can be installed in or removed from a single-user-mode
environment or a multi-user-mode environment.
• Note that, if the /var directory is set up on a different partition than the
root directory (/), no logs will be output to the /var/log/messages file
until the /var directory has been mounted during the OS start process.
• If multiple OSs exist on a disk that differs physically or logically within the
same host, HDLM can be installed on each OS. Also, if multiple kernels
exist on one OS, HDLM can be used only when the kernel installed with
HDLM is started.
Note, however, that if the OS is Red Hat Enterprise Linux 5 or Red Hat
Enterprise Linux 6, you can use HDLM even if HDLM is not installed in the
running kernel. In this case, no settings are required.
• For Red Hat Enterprise Linux, if HDLM is installed, the initscripts
package is updated, the OS is restarted, and no HDLM information exists
in the /etc/rc.d/rc.sysinit file, execute the system script update
utility (dlmupdatesysinit).
Confirm that the HDLM information is missing by executing the following
commands:
# grep DLM /etc/rc.d/rc.sysinit
If nothing is output after command execution, HDLM information is
missing.
For details about the dlmupdatesysinit utility, see
dlmupdatesysinit
Utility for Updating System Scripts on page 7-41.
• In an environment that uses SUSE LINUX Enterprise Server, after
upgrading the aaa_base, raidtools, mdadm, or lvm2 package after HDLM
installation and then restarting the OS, you must execute the
dlmupdatesysinit utility to update the system scripts if the following
conditions are satisfied:
¢
An HDLM device for which automatic mounting is specified has not
been mounted.
¢
An md device created on an HDLM device has not been activated.
¢
An LVM created on an HDLM device has not been activated.
3-98
Creating an HDLM Environment
Hitachi Dynamic Link Manager (for Linux®) User Guide