Posts Tagged 'storage cells'

Analyzing IO at the Exadata Cell level… iostat summary

While analyzing Write-Back cache activity on Exadata storage cells, I wanted something to interactively monitor IO while I was running various tests.  The problem is summarizing the results from ALL storage cell.  So, I decided to use my old friend “iostat” and a quick easy script to roll up the results for both DISK and FLASH.  This allowed me to monitor the IOPS, IO size, wait times, and service times.  

The “iostat-all.sh” tool shows the following data:

day           time  device  r      w   rs       ws     ss    aw    st
---------------------------------------------------------------------
 2013-06-24 14:40:11 DISK  47  40252   54  2667941  66.15  0.28  0.07
 2013-06-24 14:40:11 FLASH  9  40354  322  2853674  70.70  0.13  0.13
 2013-06-24 14:41:13 DISK  48  39548   80  2691362  67.95  0.31  0.08
 2013-06-24 14:41:13 FLASH  9  53677  324  3975687  74.06  0.14  0.13
…

Hopefully this will be useful for those that like to dive into the weeds using our good old friends.

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