We are experiencing a high disk I/O latency in a specific time frame in SQL server. Every day exactly at 4:30 we can see the significant difference in DISK I/O and it last upto 6:30 or 9:30 AM. I already checked with the dev team and storage team. They confirmed that every thing is running normal. Storage team declared that there is no issue in LUN and they are blaming the SQL server. One thing is sure. Some job is triggering exactly at 4 :30AM every day which causes the high disk I/O. But I am not sure how to find that out.I attached the screen shot of the SQL error log at 4:30 AM. All the monitoring tools and the logs are stating that the transactions are taking longer that usual due to high disk I/O. But no where mentioned where the smoking gun is.
Ours is 3 node Always ON environment. P1 – primary, P2 – Stand only, P3 – Read only.
The issue we are facing now is from P3 (Read only node).
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