I found a workaround on this issue. Please see attached KB.
Hi All,  We are planning to use (isi_vol_copy_vnx) to move data from VNX to Isilon. Our CIFS server (on VNX) is created using VDM. Have couple questions.  <> In the syntax below, can you guys confirm if the IP refers to the interface used while creating the CIFS server on VNX.                isi_vol_copy_vnx <IP>:/ /ifs/data/vnx_migration/test -full -sa  username   <> Our file systems are backed up using NDMP. Since this command (isi_vol_copy_vnx) also uses NDMP, there is a concern that it might reset the NDMP markers on the file systems, forcing the next backup to be full (instead of incremental). Should we be worried?  Thanks Guru Padukone.
isi_vol_copy_vnx