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26 Dell HPC NFS Storage Solution – High Availability (NSS7.0-HA) Configuration
A.2. mdtest
You can download mdtest from http://sourceforge.net/projects/mdtest/. Version 1.9.3 was used in these
tests. It was compiled and installed on an NFS share that was accessible by compute nodes. mdtest is
used with mpirun. For these tests, OpenMPI version 1.10.0 was used. The following table describes the
mdtest command-line arguments.
Appendix A — Mdtest command line arguments
mpirun ARGUMENT
DESCRIPTION
-np
Number of processes
--nolocal
Instructs mpirun not to run locally
--hostfile
Tells mpirun where the hostfile is located
mdtest ARGUMENT
DESCRIPTION
-d
The directory mdtest should run in
-i
The number of iterations the test will run
-b
Branching factor of directory structure
-z
Depth of the directory structure
-L
Files only at leaf level of tree
-I
Number of files per directory tree
-y
Sync the file after writing
-u
Unique working directory for each task
-C
Create files and directories
-R
Randomly stat files
-T
Only stat files and directories
-r
Remove files and directories left over from run