Determining Disk Throughput
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Determining Disk Throughput - (Sun) by Jeff Hunter, Sr. Database Administrator Overview This document provides several example on how to test and determine disk throughput. Write Example #1 Here is an easy solution to determine the time (and throughput) on how long it would take to write 1GB of data to a file. Keep in mind that you will also want to perform (and time) a sync after the write has completed: # rm -f /u07/app/test/gigfile # sync; time dd ibs=1048576 obs=1048576 count=1024 if=/dev/zero of=/u07/app/test/gigfile 1024+0 records in 1024+0 records out real user sys
0m36.41s 0m13.36s 0m17.73s
# time sync real 0m0.15s user 0m0.00s sys 0m0.04s
From the above, we can estimate that I am getting roughly 28.01 MB/sec. 1024 MB / (36.41 + 0.15) (s) = 28.01 MB/sec.
0m36.41s 0m13.36s 0m17.73s
# time sync real 0m0.15s user 0m0.00s sys 0m0.04s
From the above, we can estimate that I am getting roughly 28.01 MB/sec. 1024 MB / (36.41 + 0.15) (s) = 28.01 MB/sec.
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