hi to all. is my first post so hello to all freinds.

i have dhis problem just on vmware server

i try a lots time but same

Code:
root@ns1:~# sudo su
root@ns1:~# echo 3 > /proc/sys/vm/drop_caches
bash: /proc/sys/vm/drop_caches: Permission denied
root@ns1:~# sync
root@ns1:~# sudo su
root@ns1:~# sync
root@ns1:~# echo 3 > /proc/sys/vm/drop_caches
bash: /proc/sys/vm/drop_caches: Permission denied
root@ns1:~# sudo sync; echo 3 | sudo tee /proc/sys/vm/drop_caches
tee: /proc/sys/vm/drop_caches: Permission denied
3
root@ns1:~# echo 3 > /proc/sys/vm/drop_caches
bash: /proc/sys/vm/drop_caches: Permission denied
root@ns1:~# sudo -s
root@ns1:~# echo 3 > /proc/sys/vm/drop_caches
bash: /proc/sys/vm/drop_caches: Permission denied
root@ns1:~# sync; echo 3 > /proc/sys/vm/drop_caches
bash: /proc/sys/vm/drop_caches: Permission denied
root@ns1:~# sudo sync; echo 3 | sudo tee /proc/sys/vm/drop_caches
tee: /proc/sys/vm/drop_caches: Permission denied
3
root@ns1:~# sudo sh -c "sync; echo 3 > /proc/sys/vm/drop_caches"
sh: /proc/sys/vm/drop_caches: Permission denied
root@ns1:~#
on real server work fine.

drop_caches iam sure dont work on virtual servers