HP CIFS Server 3.0b Administrator's Guide version A.02.01.01

Installing and Configuring the HP CIFS Server
Other Samba Configuration Issues
Chapter 2 41
To counteract the possible performance impact, you can control how
often Samba scans for changes in the directories it has been requested to
monitor. The parameter that controls how often Samba scans for changes
is Change Notify Timeout. The parameter value represents the number
of seconds between the start of each scanning cycle. The default value is
60. So, if your system takes 55 seconds to complete the scan of all the
directories with Change Notify requests, it would be under a heavy load
at nearly all times.
You can increase the Change Notify Timeout value to a larger number to
decrease how often these Change Notify directory scans are done. The
trade off is that your clients will take longer to see that changes were
made in the directories that they have placed Change Notify requests on.
You will have to decide what the right trade-off is: performance loss or
slow updates to client file browsers.