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OCFS2: High Amount of Concurrent Read/Write Access (Parallel Access from Multiple Nodes in Same Time ) Causing Performance Issues (Doc ID 1924137.1)

Last updated on MAY 03, 2022

Applies to:

Linux OS - Version Oracle Linux 5.6 and later
Oracle VM - Version 3.3.1 to 3.3.1 [Release OVM33]
Oracle Cloud Infrastructure - Version N/A and later
Linux x86
Linux x86-64

Goal

 Example Scenario

- 2 OCFS2 Nodes

- Single OCFS2 volume 

- Single FC LUN

- 1Gbit Network Interface

For the test purposes du command is being used as example.

First test is executed by doing du command first on node 1 then on node 2:

Result is drastically different, it took almost one hour to finish the test while both nodes were trying to execute du command on shared OCFS2 volume.

Example OCFS2 volume /ocfs_test holds relatively small files

Solution

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In this Document
Goal
  Example Scenario
Solution
 Explanation
 Possible workaround with drawback 
 Recommendation
 Example cases 
 Conclusion
References


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