Siebel Process (siebmtshmw or flush) Hang Issue With High %IOWAIT Running On Exalogic Elastic Cloud Software (EECS) 1.x Releases
Last updated on OCTOBER 31, 2017
Applies to:Oracle Exalogic Elastic Cloud Software - Version 220.127.116.11.0 to 18.104.22.168.4
Information in this document applies to any platform.
In Exalogic environments with Exalogic Elastic Cloud Software (EECS) 1.0 version when running Siebel applications together with potentially other products from the Oracle Fusion Middleware product family such as Oracle Business Process Management (BPM)/Oracle SOA Suite (SOA)/Oracle Data Integrator (ODI), problem of Siebel process getting hung is observed.
At the time of the issue while monitoring the system by executing iostat -c command over time you see that the value reported for %iowait is continually growing and reaches a very high percentage on the Exalogic compute node on which Siebel is running. In addition, output from the ps command shows many Siebel related process have reached a defunct state.
Below is snippet of outputs you can observe using following commands at the time of the issue.