@orfenegro 

Two things you can try:

1. Try to re-config the VLAN settings. The "LAG port" may not work with VLAN that configured before;

2. Try Balance XOR option on the NAS

  @Somnus Hi ,

ty for the help i will try to rebuild vlans but i have no hope for that, and i dont want to use balance xor as i understand it doesnt speed up transfer speed just load balancing or failover am i right?

  @orfenegro 

From what I know, balance xor should also improve the bandwidth. It's kinda like "static LAG" or "manually LAG".

802.3ad is LACP or "auto" LAG

  @Somnus 

I've managed to make it work finally with 802.3 ad, at least i can access nas from web console. The mistake i was making was, at vlan settings there was lag section which i didnt see. I removed the lag from vlan1 and set it to vlan10. Also removed ports from unit1 from both of them. Sadly performance is 50-55 mb write and 70-75 mb read with raid0 wd red pro drives Which is lower than ts-431 system specs. (80mb write- 110mb read)

  @orfenegro 

For anyone who may have the same problem with me, i missed the section seen in the picture below