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I've been asked to investigate adding extra memory (> 16gb) to a RHEL 4 server and moving to a huge mem kernel. The server is used for Oracle RAC.

Is it just a case of installing the hugh mem kernel and booting into ? or is it more complex than that ?

Any tips / gotcha's ?

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up vote 1 down vote accepted

I use a BIGMEM kernel on Debian squeeze. I've used a non-BIGMEM kernel before as well. I'm not aware of any issues or gotchas, and no changes to the system are necessary when switching between a BIGMEM and non-BIGMEM kernel. Of course, you only need to use a BIGMEM kernel if you are running a 32 bit kernel. If you have any specific concerns, mention them in the question.

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ok thanks , do I need to install any other rpms ? devel etc ? –  AndyM Jun 10 '11 at 13:35
    
@AndyM: No, just the rpm corresponding to the BIGMEM kernel. –  Faheem Mitha Jun 10 '11 at 13:42
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