Poor Performance with Oracle Redo Log I/O using direct aio via io_submit on XFS filesystems.

Solution Verified - Updated -


  • Customers who use file systems for the Oracle Redo Log, and in this specific case XFS have seen performance regressions when moving from 7.2 to 7.8.
  • Very slow io_submit syscalls lead to poor Oracle DB performance when the Oracle log writer process uses XFS filesystems, without any visible delays in iostat on the disks used by the filesystem.


  • Red Hat Enterprise Linux 7 (7.7 and newer)
  • kernel-3.10.0-1062.el7 and newer.
  • Oracle Redo Logs on XFS file systems.
  • Redo Log using direct AIO via io_submit().

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