I ran into an problem with copying files via NFS to the NAS.

  user@machine /mnt/ss4200> cp ~/somefile .

  cp: cannot create regular file `./somefile': Invalid argument

There would now be a zero byte file called "somefile".  However, if you ran the copy again now that the file exists, you could write to it.

I could not configure the users/groups/shares in the web gui in such a manner so that this would work.  Copying the same files under SMB was fine.

I finally figured this was due to ACLs being set on the filesystem which is (for whatever reason) affecting file copying under NFS.

First enable SSH on the SS4200 and log in as root.

To show your current ACLs:

  # getfacl /mnt/soho_storage/samba/shares/test

To clear these out:

  # setfacl -b /mnt/soho_storage/samba/shares/test

After doing this, I could now copy/create files without first creating the zero byte files.

This is not a complete fix however, as if you change the access lists in the web  gui it could be reset.  I also have not tried yet whether this persists after a  reboot.  It also opens the files to everyone.

It is likely possible to fix this permanently, or at least adjust the ACLs more correctly rather than just clearing them.  I have not looked into this yet.