User's Guide

IMPORTANT: In Linux, EMC PowerPath devices are presented as /dev/emcpower*
(for example, /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
combining /dev/sdb and /dev/sdc into /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 generally recommends that fstab mounts be performed using
blkid/uuid; however, this is not always employed. In that case, consider mounting
/dev/emcpowera as /var. After EMC PowerPath removal, /var would not automatically
mount to /dev/mpathx.
c. If this is for a cluster configuration, initialize the cluster and start cluster services.
d. Start applications.
8. Using the HP 3PAR Online Import Utility, execute the createmigration command with the
-migtype online option.
Example 10 Using createmigration with -migtype online
>createmigration -sourceuid xxxxxxxxxxxxxxxx -srchost "X7DBU-02-IG" -destcpg "testcpg" -destprov full
-migtype online
>SUCCESS: Migration job submitted successfully. Please check status/details using showmigration command.
Migration id: 1411673030253
This step admits LUNs presented to the EMC Storage system and exports them to the HP 3PAR
host created on the EMC Storage system.
NOTE: Be aware, the createmigration command may take several minutes to complete.
TIP: Make a note of the Migration ID as it will be used in commands to track migration
progress.
9. Execute the showmigration command to verify that the data migration task preparation
has completed successfully. This may take some time. On the successful creation of the task
the STATUS column will indicate preparationcomplete(100%).
>showmigration
MIGRATIONID TYPE SOURCE_NAME
DESTINATION_NAME START_TIME
END_TIME STATUS(PROGRESS)(MESSAGE)
1411673030253 online SYMMETRIX+000194901212
3par_7200_DCA_01 Thu Sep 25 15:
23:50 EDT 2014 -NA- preparationcomplete(100%)(-NA-)
10. Execute the showmigrationdetails command to verify the volumes being migrated. In
the preparation stage, PROGRESS for each volume will be 0% and the TASK_ID will be
unknown.
>showmigrationdetails -migrationid 1411673030253
SOURCE_VOLUME DESTINATION_VOLUME TASK_ID PROGRESS
Volume 00145 Volume_00145 |unknown| 0%
Volume 00146 Volume_00146 |unknown| 0%
>
42 Performing Online Data Migration Using Linux