EMC Celerra Command Reference Manual page 44

The fs Commands
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Celerra Network Server Command Reference Manual
Note: Although an IP address can be specified for an <nfs_server>, EMC
strongly suggests using the hostname of the server, which allows you to take
advantage of DNS failover capability.
[-read_policy_override {full|passthrough|partial|none}]
Specifies the migration method for data recall in response to
client read requests. full migrates the whole file before it returns
the requested blocks. passthrough leaves the stub file, but
retrieves the requested data from the secondary file system.
partial migrates only the blocks required to satisfy the client read
request. none (default) defaults to the read method option
specified in the stub file.
Note: The full migration may take minutes or hours if the file is very
large.
[-useRootCred {true|false}]
Specifies the user credentials that the Data Mover uses when
requesting data from the secondary Celerra Network Server.
When set to true, the Data Mover requests data as the root user
(UID 0), when set to false (default), the Data Mover requests data
as the owner of the file as specified in the stub file.
Note: If the -useRootCred option is set to true, the secondary storage
NFS server must grant the Data Mover root privilege for NFS traffic.
[-proto {TCP|UDP}]
Specifies the protocol for the Data Movers to use for
communication to the secondary <nfs_server>. TCP is the
default.
[-nfsPort <port>]
Specifies an NFS port on the secondary <nfs_server>. A default
port is discovered automatically.
[-mntPort <port>]
Specifies a mount port on the secondary <nfs_server>. A default
mount port is discovered automatically.
Note: The -nfsPort and the -mntPort options are used for secondary
servers who don't have the portmapper running. The admin starts the
nfsd and mountd daemon on specific ports to avoid hackers.