Hi, I ma installing MPICH-1.2.6 ch_p4 version on my Opteron cluster running SuSE9.1 for AMD64, the test case failed with message: ... < p2_17986: p4_error: : 1 < File locking failed in ADIOI_Set_lock. If the file system is NFS, you need to use NFS version 3, ensure that the lockd daemon is running on all the machines, and mount the directory with the 'noac' option (no attribute caching). < [2] MPI Abort by user Aborting program ! < [2] Aborting program! ... I checked my file system: Zephyr:~ # rpcinfo -p `hostname `| grep nfs 100003 2 udp 2049 nfs 100003 2 tcp 2049 nfs and found that the installed NFS is version2, How to convert it to version 3? do I need to upgrade related NFS modules? any hint is appreciated. Jyh-Shyong Ho, Ph.D. Research Scientist National Center for High Performance Computing Hsinchu, Taiwan, ROC