This topic describes considerations for the source storage type
from which you are migrating data and the target storage type to which you
are migrating data.
- Make sure that the storage pools to which the data
will be migrated contains sufficient space for the migration:
- You should have at a minimum twice the amount of space as
the total amount of data being migrated.
- Compressed files are expanded during the data migration process. Sufficient
space must be available in the SAN File System to store the expanded files.
Refer to the documentation for your operating system to determine the compression
ratio and estimate the amount of space required.
- Sparse files become dense, or full, files during data migration. Sufficient
space must be available in the SAN File System to store the dense files.
- When migrating data from a Windows-based client using the migratedata utility,
create the destination directory in the global namespace and verify that the
security attributes of the destination directory match that of the source
directory. If the security attributes do not match, the verification phase
will fail and the migrated data will have incorrect permissions.