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Oracle, Technical

Migrating to RAC/ASM with RConfig

That 11i/RAC/ASM project turned out to be fairly interesting for quite a few reasons – another reason was that it gave me an opportunity to become quite a bit more familiar with RConfig.

oem_cluster.gifRConfig an Oracle provided java-based utility to fully automate the process of converting a database from single-instance to RAC. It will also automatically move your database from a filesystem into ASM. (In case you’re wondering, it just uses RMAN in the background; really RMAN is still the only tool that can actually move a database into ASM.) RConfig is the backend used by Grid Control for its “Convert to Cluster Database” wizard.

After digging into RConfig a bit I have two main observations:

  1. RConfig wasn’t really made for the command line. It was made to be a backend for Grid Control. It takes XML input and it actually spits XML output to you at the command line – who does that? Clearly they didn’t design this output with a human in mind but rather another bit of software.

  2. RConfig was built with OEM’s “autodetect and automate everything” philosophy. It takes a small number of inputs in its tiny XML configuration file and produces a scant, undescriptive 16 lines of output. However if you enable tracing and examine the tracefile then you will see that it is doing an aweful lot of work trying to deduce almost everything imaginable about your environment. For example you can’t specify temp file size, redo thread attributes, undo tablespace names, etc… all of these values are calculated by RConfig using defaults or your source database. If you need to customize the conversion process at all then RConfig is not the tool for you.

Last time I did one of these conversions it was on 9i RAC – before RConfig was around. And in spite of its limitations I have to admit that RConfig is pretty slick when everything works and when you don’t need to tweak the conversion process. It’s straightforward and it did work well for what we needed.

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About Jeremy Schneider

Doing stuff with Oracle Database, Performance, Clusters, Linux. about.me/jeremy_schneider

Discussion

3 thoughts on “Migrating to RAC/ASM with RConfig

  1. Question, can you install 11i apps/12i apps with ASM directly? I have a consultant telling me you can’t install 12i with ASM but you have to convert it. This doesn’t make sense to me. We have a single node 12i installed without ASM. We are having our servers and SAN installed as I write. He wants to clone the instance over and convert it to RAC and ASM. I thought this might cause issues down the line and wanted to do a 12i apps install clean on the new servers with ASM. He is telling me you can’t do this and I wanted a santity check

    Posted by DJ | September 19, 2007, 4:01 pm
  2. yes that is correct.

    Posted by susheel tamrakar | July 15, 2008, 3:56 pm
  3. Hi,

    I’ve written a short tutorial to Convert 11gR2 non-RAC database to RAC database using rconfig

    Please share your thoughts and comments:

    http://zakkiahmed.wordpress.com/2010/08/04/convert-11gr2-non-rac-database-to-rac-database-using-rconfig/

    Thanks,

    Zakki

    Posted by Zakki | August 3, 2010, 5:47 pm

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(a) The views expressed on this website are mine alone and do not necessarily reflect the views of my employer.

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Jeremy Schneider
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