12 Troubleshooting
This section describes problems you may encounter when using EMC
NOTE: During the migration process, it is important to remember that the data continues to be served from the source EMC Storage system until the import of each volume is complete. If host errors occur, both the destination HP 3PAR StoreServ Storage system and the source EMC Storage system should be checked for potential problems.
Understanding the HP 3PAR Online Import Utility Data Migration Process
Understanding the migration process and the order of the procedures is helpful when troubleshooting. The diagnostic tool for EMC Storage is Unisphere; for HP 3PAR, it is the HP 3PAR Online Import Utility management interface. This section provides an overview of the HP 3PAR Online Import Utility CLI commands used and what happens when you use them, from setup to completion of the migration.
•HP 3PAR Online Import Utility: addsource
◦No change on source or destination storage system
◦Source storage system information added into the HP 3PAR Online Import Utility database
•HP 3PAR Online Import Utility: adddestination
◦No change on source or destination storage system
◦Destination storage system information added into the HP 3PAR Online Import Utility database
•HP 3PAR Online Import Utility: createmigration
◦On the source storage system:
–The HP 3PAR peer ports are added into the storage group which contains the LUNs/hosts that are being migrated (will display with name=UNKNOWN)
◦On the destination storage system:
–LUNs are admitted
–Hosts are created
–LUNs are presented to the hosts (online migration)
•HP 3PAR Online Import Utility: startmigration
◦On the source storage system:
–Hosts are removed from the storage group (except 3PAR peer port hosts)
◦On the destination storage system:
–LUNs are presented to the hosts (MDM)
–Import is started
◦Once the migration is completed:
–The HP 3PAR peer ports are removed from the source storage system group
86 Troubleshooting