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

IOzone Argument

-t

-w

-I

-O

For the sequential tests, file size was varied along with the number of clients such that the total

amount of data written was 256G (number of clients * file size per client = 256G).

IOzone Sequential Writes

# /usr/sbin/iozone -i 0 -c –e –w –r 1024k –s 4g –t 64 -+n -+m ./clientlist

IOzone Sequential Reads

# /usr/sbin/iozone -i 1 -c -e -w -r 1024k -s 4g -t 64 -+n -+m ./clientlist

For the random tests, each client read or wrote a 4G file. The record size used for the random tests

was 4k to simulate small random data accesses.

IOPs Random Access (Reads and Writes)

IOzone

# /usr/sbin/iozone -i 2 -w -r 4k -I -O -w -+n -s 4G -t 1 -+m ./clientlist

By using

and

in the test,

-c

-e

doing. The

O_Direct

which we are running the

Number of threads

Location of clients to run IOzone on when in clustered

mode

Does not unlink (delete) temporary file

Use O_DIRECT, bypass client cache

Give results in ops/sec.

provides a more realistic view of what a typical application is

IOzone

command line parameter allows us to bypass the cache on the compute node on

thread.

IOzone

Description