New LQ Infrastructure – First snag hit

As I previously mentioned, I’ve been working on moving LQ to an entirely new and updated infrastructure. Everything was going smooth and the project was actually ahead of schedule. The LQ Wiki, LQ ISO and LQ Radio are already being served by the new machines. I decided to implement Munin for performance monitoring. Like many related tools, it uses rrdtool for graphing. After a bit of debugging, it turns out that OCFS2 doesn’t support mmap yet, so all RRD writes are failing. In this particular case I can get around the problem easy enough, but I know applications (BDB comes to mind, but I am sure there are plenty of others) use mmap, so I’m wondering what else is going to fail. A post from an Oracle engineer on ocfs2-users from June 2007 said mmap support was coming soon, but I can’t find an ETA anywhere and am running the latest version. Aside from this snag, I’ve been really happy with OCFS2.


2 Responses to New LQ Infrastructure – First snag hit

  1. smushran says:

    Support for shared writeable mmap was added in OCFS2 in 2.6.23.
    Which kernel are you using?

  2. jeremy says:


    Thanks for the response. I’m using RHEL 5.1 kernel 2.6.18-53.1.6.el5 now and will be upgrading to 2.6.18-53.1.13.el5 ASAP.


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