HP 3PAR Online Import for EMC Storage Data Migration Guide

Update Host Multipath Software and Unzone from Source EMC Storage System
CAUTION: PowerPath must NOT be installed during the migration process. Native
device-mapper-multipath must be managing the paths.
CAUTION: Stop all applications before removing PowerPath. Applications should be restarted
after migration has started.
Perform the following steps on the Linux host:
1. Remove EMC PowerPath Multipath software from host following the PowerPath documentation
instructions.
2. Zone the host to the destination HP 3PAR StoreServ Storage system to establish communication.
Validate Host to Destination connectivity using the 3PAR Management Tool by confirming host
initiator login on the 3PAR StoreServ Storage System.
3. Configure device-mapper-multipath (DM) on the host.
a. Install device-mapper-multipath (if not already installed).
b. Register 3PAR LUN types with DM by whitelisting 3PAR specific information (vendor =
“3PARdata” and product = “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. Start device-mapper-multipath.
5. Modify /etc/fstab for new mount points. Remount file systems.
IMPORTANT: In Linux, PowerPath devices are presented as /dev/emcpower* (i.e.
/dev/emcpowea ). PowerPath removal in Linux ALSO removes this device type. This changes
when multipath assumes management of these devices. For example, before PowerPath removal
consider /dev/sdb and /dev/sdc being combined to /dev/emcpowera. After 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.
It is generally advised that fstab mounts are performed using blkid/uuid, however this is not
always employed. Consider /dev/emcpowera being mounted as /var. After PowerPath
removal, /var would not automatically mount to /dev/mpathx.
6. Shutdown the Linux host. Leave the host offline until the migration is started.
7. Unzone the source EMC Storage system from the host.
Start the Data Migration from Source EMC Storage System Destination to HP 3PAR
StoreServ Storage System
1. From the HP 3PAR Online Import Utility, execute the startmigration command.
Example 12 startmigration command
>startmigration –migrationid 1122334456
>SUCCESS: Data transfer started successfully
Migrating a Linux Host 35