White Papers

24 Dell HPC NFS Storage Solution – High Availability (NSS7.0-HA) Configuration
A.1. IOzone
You can download IOzone from http://www.iozone.org/. Version 3.420 was used for these tests and
installed on both the NFS servers and all the compute nodes.
The IOzone tests were run from 1–32 nodes in clustered mode. All tests were N-to-N. Meaning, N clients
would read or write N independent files.
Between tests, the following procedure was followed to minimize cache effects:
 Unmount NFS share on clients.
 Stop the cluster service on the server. This unmounts the XFS file system on the server.
 Start the cluster service on the server.
 Mount NFS Share on clients.
Table 7 describes the IOzone command line arguments.
Appendix A — IOzone command line arguments
IOzone Argument
Description
-i 0
Write test
-i 1
Read test
-i 2
Random Access test
-+n
No retest
-c
Includes close in the timing calculations
-t
Number of threads
-e
Includes flush in the timing calculations
-r
Records size
-s
File size
-t
Number of threads
+m
Location of clients to run IOzone when in clustered
mode
-w
Does not unlink (delete) temporary file