>> I see that in both cases there is small delay before clientB sees new files.
├В┬┐What about the server itself? This may be realted to client caching.
A system administrator can try using the "noac" mount option to achieve attribute cache coherency among multiple clients. Almost every client operation checks file attribute information. Usually the client keeps this information cached for a period of time to reduce network and server load.
When "noac" is in effect, a client's file attribute cache is disabled, so each operation that needs to check a file's attributes is forced to go back to the server. This permits a client to see changes to a file very quickly, at the cost of many extra network operations.
Be careful not to confuse "noac" with "no data caching." The "noac" mount option will keep file attributes up-to-date with the server, but there are still races that may result in data incoherency between client and server. If you need absolute cache coherency among clients, applications can use file locking, where a client purges file data when a file is locked, and flushes changes back to the server before unlocking a file; or applications can open their files with the O_DIRECT flag to disable data caching entirely.
http://nfs.sourceforge.net/
Por que hacerlo dificil si es posible hacerlo facil? - Why do it the hard way, when you can do it the easy way?
