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Hi Stephane,

In fact at dbi services we have professional material ;-)

Samsung SSD 840 PRO Series

Gregory Steulet

I have a write throughput 10x lower than your test (is it the SSD?)

stephane (ebu)
You obtained :Running the test with following options: Number of threads: 64 Random number generator...
stephane (ebu)

I wrote a benchmark based on your own. I'm so far from your result (which is very good for a laptop)

stephane (ebu)
Hi Stephane,It depends, you can find the stats for MySQL 5.6 below:sysbench 0.5: multi-threaded sys...
Gregory Steulet
Blog Michael Schwalm Bug on Oracle 11.2 "ORION FAILS WITH ORA-27061": Patch available!

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Bug on Oracle 11.2 "ORION FAILS WITH ORA-27061": Patch available!

In march 2011, my colleague Gregory Steulet published an article about Simulating and testing I/O performances with Orion. In this article, he wrote about a bug concerning Orion on Oracle 11.2, reported in Oracle bug number 9104898: "ORION FAILS WITH ORA-27061: WAITING FOR ASYNC I/OS FAILED".


Trying to compare performances of storage devices on a virtual machine between a classical and a paravirtual storage adapter, I experienced the same error when using large IOs. I was using a Red Hat 5 based environment, which seems to be especially concerned by this problem: 


Error completing
ORA-27061: waiting for async I/Os failed
Linux-x86_64 Error: 14:
Bad addressAdditional information: -1
Additional information: 1048576
Test aborted due to errors.


If you have already faced the problem too, there is good news! Oracle finally published a patch in November 2012 to fix this problem, reported in January ... 2009!!! The patch is available for Oracle RDBMS and  You can download it at My Oracle Support website, searching for Patch 9104898 or Patch ID 15597001.


It works fine for me now.


Don't forget to download the last version of OPatch (6880880 in My Oracle Support) before applying this patch, as recommanded by Oracle.

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Michael Schwalm is Consultant at dbi Services and has more than two years of experience in Oracle database administration. He has a broad knowledge in the realization of virtualization infrastructures such as vMware vSphere. He took his first steps in database administration as an integrator of a web applications on Unix, Oracle, and Websphere environments. Michael Schwalm is Oracle Certified Professional 11g and RAC Implementation Specialist 11g. Prior to joining dbi services, Michael Schwalm was application administrator at SOGETI Est (F) on behalf of PSA Peugeot Citroen and responsible for the realization and managing of Unix environments and Oracle databases in the context of migration projects. Michael Schwalm holds a BTS diploma in Information System Management from Belfort (F) and a TSAR diploma in advanced network administration from Strasbourg (F). His branch-related experience covers Automotive, Software industry, Financial Services / Banking, etc.


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