Administrator Guide

References
50 Dell EMC Ready Solution for HPC PixStor Storage | Document ID
IOR (N to 1)
The following command is an example to run the IOR N-1 performance tests:
mpirun --allow-run-as-root -np $Threads --hostfile $hostlist --map-by node -np
$threads ~/bin/ior -a POSIX -v -w -r -i 3 -t 8m -b $file_size -g -d 3 -e -E -k
-o $working_dir/ior.out -s 1
Table 13 describes the IOR command line options.
Table 13 IOR command line options
Option
Description
-g
intraTestBarriers – use barriers between open, write/read, and close
-d
interTestDelay – delay between reps in seconds
-e
fsync – perform fsync upon POSIX write close
-E
useExistingTestFile – do not remove test file before write access
-k
keepFile – don’t remove the test file(s) on program exit
-o
testFile – full name for test
-s
segmentCount – number of segments