User's Guide

c. Unmount the application file systems, bring offline any raw devices (if configured), and
deactivate any volume groups where Logical Volume Manager is in use.
d. Uninstall EMC PowerPath from the host, following the EMC PowerPath documentation
instructions.
2. Zone the host to the destination HP 3PAR StoreServ Storage system to establish communication.
Using the HP 3PAR Management Console, verify host-to-destination connectivity by confirming
host initiator login on the HP 3PAR StoreServ Storage.
3. Configure device-mapper-multipath (DM) on the host.
a. Install device-mapper-multipath (if not already installed).
b. Register HP 3PAR LUN types with DM by whitelisting HP 3PAR-specific information (the
vendor is 3PARdata and the product is VV) in /etc/multipath.conf. See the
HP 3PAR StoreServ product documentation on the Linux host configuration.
NOTE: 3PARdata and VV are case sensitive.
4. Restart device-mapper-multipath.
5. Modify /etc/fstab for new mount points. Remount file systems.
6. Where applicable, make the appropriate changes to the Logical Volume Manager
configuration.
IMPORTANT: In Linux, EMC PowerPath devices are presented as /dev/emcpower* (i.e.
/dev/emcpowera). EMC PowerPath removal in Linux also removes this device type. This
changes when the Linux native device-mapper multipath assumes management of these devices.
For example, before EMC PowerPath removal, consider /dev/sdb and /dev/sdc being
combined to /dev/emcpowera. After EMC PowerPath removal, /dev/sdb and /dev/sdc
would be represented by /dev/mpathx.
This represents a challenge for customers who use direct device referencing in /etc/fstab
or other custom scripts. HP recommends that fstab mounts are performed using blkid/uuid;
however this is not always employed. For example, if /dev/emcpowera is mounted as /var,
then after the EMC PowerPath removal, /var would not automatically mount to /dev/mpathx.
7. Shut down the Linux host. Leave the host offline until the migration is started.
8. Unzone the source EMC Storage system from the host.
9. HP recommends that you change the HP 3PAR host persona/host OS to the appropriate setting
before enabling access to the HP 3PAR array.
NOTE: EMC Storage arrays do not implement specific OS settings when registering host
initiators on the EMC Storage array. During migration, online import cannot determine the
host OS when migrating the hosts to the HP 3PAR StoreServ Storage. All hosts that are being
created on the HP 3PAR StoreServ Storage during EMC migration are set by default to host
persona 2.
Starting the Data Migration from Source EMC Storage System to Destination
HP 3PAR StoreServ Storage System
1. From the HP 3PAR Online Import Utility, execute the startmigration command.
Example 35 startmigration command
>startmigration –migrationid 1122334456
>SUCCESS: Data transfer started successfully
2. To view the status of the migration, execute the showmigration command.
58 Performing MDM Using a Linux Host