During the last downtime at NOAA, we discovered that the slow metadata performance reported in LU-2649 had returned. The strange thing is that when the clients were shutdown, the performance returned to normal. The current theory is that the jobs that run on one filesystem are taking more/different locks than the jobs on the other. We are taking a downtime next Thursday to investigate this more, but would like some pointers as to what we can look for. Does this theory make sense?