You should be aware of certain things that affect the performance of your Foreign LUN Import, such as certain variables, best practices and host remediation.
Performance enhancements in ONTAP 8.3.1
There have been some enhancements to FLI to better manage performance and stop workload starvation from occurring. FLI enhancements in ONTAP 8.3.1 include a new throttle command and LUN import show enhancements showing throughput and QoS policy groups.
Best practices for Foreign LUN Import migration
NetApp strongly recommends a professional services or partner professional services, engagement to scope and plan the migration as well as to train customer personnel on how to perform data migrations using Foreign LUN Import (FLI) 7-Mode to ONTAP.
ESXi CAW/ATS remediation
Online FLI does not support VMware Atomic Test and Set (ATS)/SCSI Compare and Write (CAW). This is important if you are using VMFS5 and your source array supports CAW. To remediate the host you must follow the process outlined in this section.
Host remediation
Depending on the type of migration, host remediation may take place inline to the migration (Foreign LUN Import online, and 7-Mode to ONTAP) or might it occur after the migration is complete (Foreign LUN Import offline).
Clearing SCSI-3 persistent reservations
If you have a Windows cluster, you need to remove SCSI-3 reservations for the quorum disk, even if all clustered hosts are offline.
Creating the host to destination zones
You will need to create the host to destination zones. There are two types of production fabric, fabric A and fabric B.