>I will try changing the logging to use separate files for a day or >so to at least see what effect it has with regards to this issue...stay tuned.
Okay, that was easy to test, and fail -- still plenty of lag situations. As expected, the results agree with another test I did which was to shut down one of the two nodes to the point of unmounting the shared filesystem. I believe the problem here is that actual chid processes of Apache locally sharing the logfile is just as bad as sharing across nodes. Maybe perhaps that is the root cause of the problem, and the fact that additional nodes are affected is just consequential. Michael Moody suggested not using prefork MPM, presumably for this reason. I wonder, does the worker MPM "consolidate" all the writes from the threads within a worker into a single buffered write stream? If so, I can see how having 32 threads per worker would not reduce the amount of writes to the logfile, but could reduce the amount of contending I/O requests by a factor of 32. Is this the case? Way back when we first transitioned to Apache 2.x we looked into using a better MPM, but had some necessary modules installed that were not thread-safe, and thus would only work with prefork. I am pretty sure this is still a constraint for us at this point. _______________________________________________ Ocfs2-users mailing list Ocfs2-users@oss.oracle.com http://oss.oracle.com/mailman/listinfo/ocfs2-users
