NFS file sync issue from one server to another server

Can you explain in more details what you mean ?

I am assuming you mean that you don't see the metadata updating in real time from the other client? If so, this is normal as clients will cache metadata for performance reasons. I'm surprised it's only one second. If you want to turn this off, there is a client mount option to turn off attribute caching. The option depends on your client OS, on some it is 'noac', on others it is 'actime=0'. Check your man pages for the way to disable attribute caching. Keep in mind, that by doing so you are increasing the metadata load on the server.

If this is not what you mean, please clarify.

I guess i have not clearly explained my question. Here is the scenario with example:

In server 1, am creating the file1.

#vi file1

Linux

:wq!

We have some scripts to check the file creating/writing time in detailed way. The same nfs share(test1) is mounted in server2 as well.

So when i look into the file creation time in both the servers. here is the output of last modified time of file1 in both the servers:

Server1:

file1 - 12:35:00 am

Server2:

file1 - 12:35:01 am

So i want to know why there is a 1 second difference in file modified time. I have created the file1 in server1 at 12:35:00 am, but the same file when i look into the Server2, its showing as 12:35:01 am. Its a same file which is saved in the filesystem, the nfs share is mounted in both the servers.

While using NFSR4 version, we are often seeing this 1 second difference in file modified time for most of the files, when using NFSR3 version, its not occurring often, but still we could see this 1 second difference in some of the files.

Make sure to disable attribute caching on the client

I have a doubt here. Instead of disabling attribute caching on the client, shall i proceed with disabling read-write delegation for file system. Please let me know your suggestions.