Hi all,
we have come across an issue which we believe might be related to
locking when storing PHP session data on an NFS share. To test the
problem we have written a very simple PHP script which basically just
calls session_start() with session.save_path set to the mounted NFS
share. Running this script from multiple tabs in firefox we find that
the first two sessions start fine but subsequent sessions start 30
seconds apart. If we run the same test on a RHEL 4 box with the same NFS
share mounted then all sessions start simultaneously. This only happens
when the session.save_path is on an NFS share - local file system works
fine.
We are mounting the NFS share using exactly the same parameters on both
RHEL 5 and RHEL 4 clients, i.e. rw,hard,intr,noatime,nodiratime
We believe that this might be due to the NFS client somehow missing the
notification that a locked file has been released - this would fit the
30 second delays that we are seeing. Are there some subtle differences
between RHEL 4 and RHEL 5 NFS clients that could be causing this?
Thanks in advance,
--
Mike Zanker
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