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.
1
[root@aix:/] lptest 127 32 > /tmp/file
1
2
[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.
1
2
3
4
5
6
7
[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:
1
1024 MB / 2.96 s = 345 MB/s

WRITE throghput is 345 MB/s

  • Let’s make a sequential READ test.
1
2
3
4
5
6
7
[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:
1
1024 MB / 4.83 s = 212 MB/s

READ throghput is 345 MB/s

0 (0)
Article Rating (No Votes)
Rate this article
Attachments
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Full Name
Email Address
Security Code Security Code
Related Articles RSS Feed
Awesome Command to show top 15 processes using memory on AIX
Viewed 25005 times since Thu, Nov 29, 2018
AIX, Monitoring, Networking, Red Hat, Security, System Admin↑ Determining type of system remotely
Viewed 3192 times since Fri, Apr 19, 2019
Getting list users and groups in AIX
Viewed 5236 times since Mon, May 28, 2018
Manually Editing /etc/filesystems Can Cause Issues
Viewed 6734 times since Tue, May 22, 2018
Reconfigure RSCT ID to fix DLPAR issues on cloned AIX systems
Viewed 17185 times since Thu, Feb 21, 2019
IVM and VLAN Tagging
Viewed 11520 times since Mon, May 28, 2018
AIX smtctl The smtctl command controls the enabling and disabling of processor simultaneous multithreading mode.
Viewed 16350 times since Fri, Jan 18, 2019
Remove disk from volumegroup in AIX
Viewed 8337 times since Tue, Apr 16, 2019
AIX Power replacing (hot-swap) failed disk in rootvg
Viewed 4680 times since Tue, Apr 16, 2019
System Admin Mirrorvg without locking the volume group
Viewed 4031 times since Mon, May 21, 2018