I would try to refresh the replication session from the source control station before deleting and recreating it. It shows the status as OK so I'm curious if a refresh would complete or fail.  nas_replicate -refresh qlctst_datastore_R -background  You can then verify the status of this task by looking at nas_task -l | head.
I have a file system replication that hasn't synced since November. In poking around I noticed HDA3 on the control station was 100 utilized. I corrected that however the replication still has not synced. Most of my experience with VNX is when they are being used as Block only.   [root[NAME] tools]# nas_replicate -info qlctst_datastore_R ID = 162_APM00XXXXXXXXX_2007_14418_APM00XXXXXXXXX_2007 Name = qlctst_datastore_R Source Status = OK Network Status = OK Destination Status = OK Last Sync Time = Tue Nov 24 02:17:29 EST 2015 Type = filesystem Celerra Network Server         = dubvnxcs01 Dart Interconnect = qlccs01-vnxnas04-repl Peer Dart Interconnect         = dubcs01-vnxnas04-repl Replication Role = source Source Filesystem = qlctst_datastore Source Data Mover = server_2 Source Interface = 10.251.89.57 Source Control Port            = 0 Source Current Data Port       = 51093 Destination Filesystem         = qlctst_datastore Destination Data Mover         = server_2 Destination Interface          = 10.255.89.57 Destination Control Port       = 5085 Destination Data Port          = 8888 Max Out of Sync Time (minutes) = 10 Current Transfer Size (KB)     = 55304 Current Transfer Remain (KB)   = 55304 Estimated Completion Time      = Current Transfer is Full Copy  = No Current Transfer Rate (KB/s)   = 0 Current Read Rate (KB/s)       = 0 Current Write Rate (KB/s)      = 0 Previous Transfer Rate (KB/s)  = 297 Previous Read Rate (KB/s)      = 19985 Previous Write Rate (KB/s)     = 1171 Average Transfer Rate (KB/s)   = 293 Average Read Rate (KB/s)       = 15858 Average Write Rate (KB/s)      = 1576   nas_cel -interconnect -v id=20003 qlccs01-vnxnas04-repl: has 1 source and 1 destination interface(s); validating - please wait...ok  1456325677: RCPT: 6: RcpTransportSender::openStream localip:10.251.89.57 localport:65279 handle :0x03330821c0 1456325677: RCPT: 6: RcpTransportSender::rcpclose() done on handle:0x03330821c0 1456325679: RCPT: 6: RcpTransportSender::openStream localip:10.251.89.57 localport:51864 handle :0x03330821c0 1456325679: REP: 6: DpCopierSender::setLatency TCP window is too small (285), setting it to twice msg size (524288) 1456325679: REP: 6: DpCopierSender::setLatency - RepSession=160_APM00XXXXXXXXXX_2007_14413_APM00XXXXXXXXXX_2007 set to 524288 1456325679: REP: 6: 31: Source=160_APM00121202958_2007_14413_APM00121202959_2007(alias=qlcprd_datastore_R), transferring. Data connection up.
VNX File Replication hasn't synced since November