nfs lock question

[lshu]

Hi everyone,

I setup a NFS server and 2 clients, they are both HP-UX 11.23. The file system exported from server can be mounted on clients without any issue. Then I did a test like this:
logon to both clients and edited the same file on the mounted file system at the same time; to my surprise, there is no error reported and I don't see any lock file under /var/statmon/sm in nfs server.

I think it is an error in the system. Am I right? In what situation, should I see a lock file? If it is an error, how can I fix it?

any comment is appreciated.
Thanks
Lorne

[Dennis Handly · Accepted solution]

Just about nothing is locked by default.
On Unix, you are suppose to use tools like rcs(1), and permissions, before you edit a file.

Some editors may tell you that the file has changed before you save it.

To get locks, the application must call lockf(2) or other fancier locks for databases.

[lshu]

Thanks!