Migrating to DMP from IBM Multipath IO (MPIO)
See Migrating LVM volume groups to DMP
This procedure describes removing devices from MPIO control and enabling DMP on the devices.
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 take the devices out of MPIO control and enable DMP
Obtain the corresponding MPIO suppression ODM packages for the array from the array vendor.
Stop the applications that use the MPIO devices.
Unmount the file systems on the MPIO devices.
Vary off the LVM volume groups.
# varyoffvg vgroupname
Install the ODM packages from the array vendor. Refer to the array vendor documentation for the installation procedure.
Some array vendors do not distribute ODM Pre-defines for their arrays for AIX. In this case, you can use the devices as hdisk devices, as long as MPIO does not claim these LUNs.
Turn on the DMP support for the LVM volume groups. This command also enables DMP root support.
# vxdmpadm settune dmp_native_support=on
Reboot the system.
After the reboot, DMP controls the devices. Any LVM volume groups on MPIO devices are migrated onto DMP devices.
Mount the file systems.
Restart the applications.