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Improving NFS Performance on HPC Clusters with Dell Fluid Cache for DAS

B.2. mdtest

can be downloaded from http://sourceforge.net/projects/mdtest/. Version 1.8.3 was used in

mdtest

these tests. It was compiled and installed on a NFS share that was accessible by compute nodes.

is launched with mpirun. For these tests, Intel MPI version 4.1.0 was used. One million files

mdtest

were created, stated and unlinked concurrently from multiple NFS clients on the NFS server. The

following table describes the

mpirun ARGUMENT

-np

-hostfile

-d

-i

-b

-z

-L

-I

-y

-u

-C

-R

-T

-r

As with the IOzone random access patterns, the following procedure was followed to minimize cache

effects during the metadata testing:

•

Unmount NFS share on clients.

•

Stop the NFS service and umount the XFS file system on the server.

•

Mount XFS file system on the server and start the NFS service.

•

Mount NFS Share on clients.

command-line arguments.

mdtest

DESCRIPTION

Number of processes

Tells mpirun where the hostfile is

The directory mdtest should run in

The number of iterations the test will run

Branching factor of directory structure

Depth of the directory structure

Files only at leaf level of tree

Number of files per directory tree

Sync the file after writing

unique working directory for each task

Create files and directories

Randomly stat files

Only stat files and directories

Remove files and directories left over from run