File_System_Migration

Planning and Design
Evaluate migration
issues
Step Action
To outline areas to consider with regard to migration issues, perform
the following:
1 Document future plans for the VNXstorage configuration.
The migration analyst must understand growth potential regarding VNX requirements. At a minimum, obtain
growth patterns over the last several months on each of the identified file systems. Take that information and
increase the value by a minimum of 20%.
2 If appropriate, review and document the Windows domain model for trust relationships from the CIFS source
file server's domain to other domains in the environment.
For every domain with a trust to the source file server, ensure that there is a domain entry in Usermapper.
3 Identify any additional hardware required to achieve the migration.
Additional hardware could be limited to a UNIX workstation or Windows client that acts as an NFS or domain
client in the network, or might include adding NICs to each server for the purposes of providing a private
network.
Additional switches and other network hardware might be necessary to accomplish the migration in a timely
manner.
4 Consider that CDMS requires that a Data Mover mount an NFS or CIFS source file server to permit the
copying of files to the MGFS.
Although the source file servers must be shared or exported to permit this, they might be shared with
permissions limited to allow only the destination Data Mover to access the source, and deny any other
means of access which could modify the source during the migration.
5 Determine whether any of the NFS source file servers are NetApp servers.
If NetApp servers are present, migration from the server requires additional migration steps. Appendix E,
“Network Appliance Considerations,” provides further information about the steps required for this particular
environment.
This release of CDMS does not support migration of CIFS data from NetApp servers.
6 Identify any additional software or software upgrades required to achieve the migration.
If the target VNX is not running version 5.6 or later, you must install a software upgrade.
7 Define any other constraints pertinent to the migration effort.
Note: Even if the Data Mover is configured for Virus Checker, the data
migration of CDMS with the server_cdms command script does not trigger
Virus Scan as long as scan on read is turned off on the Data Mover. If scan on
read is turned on, the CDMS data migration does trigger Virus Scan. In this
case, the performance impact on the Virus Checker software and the Data
Mover must be considered.
80 VNX File System Migration Version 2.0 for NFS and CIFS User Guide 7.1