problem seeing file new on both server centos

[alireza baghery]

hi
i have two server *CentOS 6.5* and
*CentOS 5.9 *
i have one *SAN Storage* on both servers
but when i create file one of server (example Centos 6.5) Other Sever
(Centos 5.9) do not see file
and i must *umount* Disk to seeing files new
how solve this problem
format disk *EXT3*
Tnx
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