Software :: Identify What Process Are Making Up The WA Statistic?

Dec 23, 2008

I have a WA% between 50-80%.

So I have a few questions.

1. Is that WA% only disk I/O or can it include network IO?
2. How do I identify which processes are making up that WA statistic?
3. Why does iostat report 100% utilization when the drive read/write speeds are under 1MB/s?

The reason I'm asking.

My Oracle stats are saying that the drives are running at about 5MB/s right now, the WA is 55%, and the iostat -m -x is reporting the drives running at 100% utilization with a read/write rate under 1MB/s. The read speed of the drive is 98MB/s (tested with hdparm -tT when I installed the drives)

I know I have a few queries using full tables scans which I'm working on but I'd think that 100% utilization should be running at the full 98MB/s.

I want to try to identify which process (most likely and oracle one) is using the 100% utilization/55% WA.

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