While creating directory using mkdir ,these directories are not created in newly added server(on 4th server but avail in 3rd brick).this works fine from fuse mount clients.

step 0:
create dht with 2 servers.
mount (nfs) it on client.
add brick 3


step:1
nfs-mount-client#mkdir some-dir
-this will be avail. in brick3

now add brick 4

step:2
nfs-mount-client#mkdir some-new-dir
-this will be avail. in brick3 but in brick4 

when doing ls -l from glfs-mount this dirs appears in brick4
fuse-mount-client#ls -l