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Slow performance and IO timeout reported by DB application

  1. Last updated
    Feb 17, 2025
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Views:
39
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
perf
Last Updated:
2/17/2025, 2:58:19 PM

Applies to

  • ONTAP
  • NFS
  • Oracle DB

Issue

  • An Oracle alert log indicates that the Log Writer (LGWR) process is experiencing significant delays due to disk I/O operations.
  • The application report the following error:
LGWR : Waits for event 'Disk File Operations I/O' for 66 secs
    .... 76 secs
   ---- 126 sec
 LGWR waits on event 'enq: CF - contention' for 90 secs
 
  • No storage layer performance contention is noticed, and latency is in sub-milliseconds.

 

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