On Wed, 2005-02-09 at 14:02 -0500, Devin Bougie wrote: > Hi All, > > We have been struggling with what appears to be a bug in RH kernels. > This results in local disk I/O blocking all NFS I/O (and, as we show, > subsequent local I/O). This appears easy to reproduce: > ---- I just tried this set of steps. Cluster, running SL 3.03, kernel 2.4.21-27.0.1ELsmp on client and server. The server is a Sunfire V40z - four Opteron. The clients are a mix of V20s and V40s. I did tests on a V40, running as root. Step 5, client touching a file on the NFS share when the I/O is running, seems to take a mean of about 5 seconds. Step 6 times are unaffected - no time increase.