By Akanksha Sheoran Kaler on Sep 17, 2013
As Product Manager for Oracle Enterprise Manager, one question that is often being asked to me is how much is the upgrade downtime and how it can be reduced?
One easy way to reduce the downtime while doing patch set upgrades is to perform Software only upgrade and then shutdown the existing OMS for the upgrade. This approach will not completely eliminate the downtime but reduce it to a great extent.
When I mention patch set upgrade, we cover following upgrade paths:
a) 22.214.171.124 (with Bundle Patches 1) to 126.96.36.199/ 188.8.131.52
b) 184.108.40.206 to 220.127.116.11
Following table compares the steps required for regular installation (OUI) and software only installation.
As you may notices from the steps listed above, regular OUI upgrade requires stopping OMS before invoking runInstaller and keeping it down until the upgrade is complete. On the other hand Software only upgrade first copies the bits and sets up the environment before stopping OMS, thus reducing the upgrade downtime.
Next comes Agent upgrade. While we recommend Agent Upgrade Console (AUC) to upgrade agents from 18.104.22.168 (with bundle patch1) /12.0.1.02 to 22.214.171.124, sometimes it’s not clear what happens during the Agent upgrade and when is the actual downtime . So here are high level steps describing the complete process:
The actual downtime while doing the agent upgrade is on step9 where we shut down your old agent. When the agent is in blackout from step 1 to 8 it still collect’s all the monitoring data so there is no loss.
More Information: It is recommended to go through the below checklist notes before starting your upgrade
MOS note 1568143.1 - EM 12c R3: Checklist for Upgrading Enterprise Manager Cloud Control from Version 12.1.0.x to 126.96.36.199
MOS Note 1569883.1 EM 12c R3: Checklist for Upgrading Management Agents Version 12.1.0.x to 188.8.131.52
EM 184.108.40.206 Install and Upgrade collateral page(PPT,Recorded demo,Whitepapers) on OTN:http://www.oracle.com/technetwork/oem/install-upgrade/index.html
Upgrading to Enterprise Manager 12c: Best Practices and
Real World Lessons
Wednesday, June 5, 2013 12:00 PM - 1:00 PM CST
Join the IOUG webcast to learn how CernerWorks, the remote hosting division
of Cerner, a global health IT company, upgraded their Oracle Enterprise Manager
system from 11g to 12c.
In this webcast , Aaron Rimel from Cerner and Akanksha Sheoran from Oracle will discuss available upgrade paths and why Cerner chose what the upgrade path they followed.
With thousands of managed databases in Cerner's IT environment, high availability, ease of upgrade and minimal downtime were key requirements for the upgrade process. You will learn how all of these requirements were met with proper planning and out-of-the-box features included with Oracle Enterprise Manager 12c.
Recently Oracle announced incremental release of Enterprise Manager 12c called Enterprise Manager 12c Release 2 (EM12c R2) which includes several new exciting features (Press announcement). Right before the official release, we upgraded an internal production site from EM 12c R1 to EM 12c R2 and had an extremely pleasant experience. Let me share few key takeaways as well as few tips from this upgrade exercise.
I - Why Should You Upgrade To Enterprise Manager 12c Release 2
While an upgrade is usually recommended primarily to take benefit of the latest features (which is valid for this upgrade as well), I found several other compelling reasons purely from deployment perspective.
Note: BP1 patches are not mandatory to upgrade to EM12c R2 release
EM 12c R2 provides an excellent opportunity to standardize your Cloud Control environment (OMS, repository and agents) and plug-ins to latest versions in single shot.
Plug-in Upgrade or Migrate
II - Few Tips To Remember
In my last post (blog link) I shared few tips and tricks from my experience applying the Bundle Patch. Recently I upgraded the same site to EM 12c R2 and found few points that you must take note of, while planning this upgrade. The tips below are also applicable to EM 12c R1 environments that do not have Bundle Patch 1 patches applied.
We are very excited about this latest release and will look forward to hear back any feedback from your upgrade experience!
Latest information and perspectives on Oracle Enterprise Manager.