Calculate hdisk READ / WRITE throughput (sequential IO) from AIX systems

Do you know the throughput of your disks? This time we’re going to calculate read / write throughput of hdisks from an AIX system.

  • Let’s create a file for this test.
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[root@aix:/] lptest 127 32 > /tmp/file
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[root@aix:/] ls -ltr /tmp/file
-rw-r-----    1 root     system         4096 Feb 07 16:22 /tmp/file
  • Let’s make a sequential WRITE test.
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[root@aix:/]  timex dd if=/dev/zero of=/tmp/file  bs=1m count=1000
1000+0 records in.
1000+0 records out.
 
real 2.96
user 0.00
sys  1.67
  • Now divide 2014 / “real” number to get MB/s throughput.
    In this example:
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1024 MB / 2.96 s = 345 MB/s

WRITE throghput is 345 MB/s

  • Let’s make a sequential READ test.
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[root@aix:/] timex dd if=/dev/rhdisk3 of=/dev/null bs=1m count=1024
2048+0 records in.
2048+0 records out.
 
real 4.83
user 0.00
sys  0.32
  • Now divide 2014 / “real” number to get MB/s throughput.
    In this example:
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1024 MB / 4.83 s = 212 MB/s

READ throghput is 345 MB/s

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