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Sounds like a good idea to me.


On Tuesday January 19, 2010, Andy Kurth wrote:
> I'd like to propose a design change for the modularized backend code.  The
> provisioning modules (xCAT.pm, vmware.pm, etc) are currently responsible
> for monitoring and waiting for the computer's OS to respond after an image
> has been loaded.  It would be better if this task were handled by the OS
> modules because the sequence of things to monitor and the appropriate
> timeouts vary widely among OS's.
> This will solve a problem currently affecting Windows Server 2008, Vista,
> and most likely 2007.  Sysprep's mini-setup phase takes a horrendously long
> time with the newer OS's compared to XP and 2003.  This is causing timeouts
> to be reached before Sysprep is done.  There is currently no way to specify
> longer timeouts for the newer versions of Windows without having it apply
> to all OS's. Having the OS module monitor and wait for the computer to
> respond would solve this problem.
> To accomplish this, the waiting/monitoring responsibility would be moved to
> the post_load() subroutine in the OS module and new.pm will keep track of
> the install attempt count, passing it to load() and post_load().  The
> sequence is: 1. new.pm calls $provisioner->load($install_attempt)
> 2. new.pm calls $os->post_load($install_attempt)
> The return value sent back to the new.pm module by the provisioning
> module's load() subroutine would be:
> 1: computer is done being loaded and ready for OS post_load()
> 0: error occurred, attempt image load again
> undefined: error occurred, don't attempt load again
> The return value sent back to new.pm from the OS module's post_load() would
> be: 1: computer OS is configured and ready for a reservation
> 0: error occurred, attempt image load again
> undefined: error occurred, don't attempt load again
> Having new.pm keep track of the attempt count and pass it to the load() and
> post_load() subroutines allows them to be able to use this value to adjust
> their timeouts and return values if appropriate.
> This will also remove the SSH dependency from the provisioning modules. 
> There was a thread a few months ago about supporting methods other than SSH
> to control computers.  This will facilitate that feature.
> I created VCL-291 and will begin to work on this.  Please reply if you have
> any thoughts or suggestions.
> Thanks,
> Andy
- -- 
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Josh Thompson
Systems Programmer
Advanced Computing | VCL Developer
North Carolina State University


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