Migrating to DMP from Hitachi Data Link Manager (HDLM)
See Migrating LVM volume groups to DMP
This procedure describes removing devices from HDLM control and enabling DMP on the devices.
DMP cannot co-exist with HDLM; HDLM must be removed from the system.
Plan for system downtime for the following procedure.
The migration steps involve system downtime on a host due to the following:
Need to stop applications
Need to stop the VCS services if using VCS
The procedure involves one or more host reboots
To remove devices from Hitachi Data Link Manager (HDLM) and enable DMP
Stop the applications using the HDLM meta-device
Unmount any file systems that use the volume group on the HDLM device.
Stop the LVM volume groups that use the HDLM device.
# varyoffvg vgroupname
Uninstall the HDLM package.
Turn on the DMP support for the LVM volume group.
# vxdmpadm settune dmp_native_support=on
The above command also enables DMP root support.
Reboot the system.
After the reboot, DMP controls the devices. If there were any LVM volume groups on HDLM devices they are migrated onto DMP devices.
Mount the file systems.
Restart the applications.