[Libvirt-cim] [PATCH 2 of 3] [TEST] #2 Add VSMS 15_mod_system_settings.py

[Guo Lian Yun]

libvirt-cim-bounces at redhat.com wrote on 2008-10-30 23:56:15:

> Guo Lian Yun wrote:
> > 
> > +1 from me.
> > 
> > I have a question of ModifySystemSettings() and 
ModifyResourceSettings().
> > ModifySystemSettings() method modify the attributes of VSSD, and 
> > ModifyResourceSettings()
> > intends to modify RASD properties, right? 
> 
> The VSSD and RASD instances are just a way of representing the 
> properties of the guest.  So these functions really aren't modifying the 

> VSSD or RASD instances themselves.
> 
> > I have to pass both RASD and 
> > VSSD instances to
> > DefineSystem() when I try to define a vs. Would you please explain 
more 
> > about VSSD and RASD instance
> > for me?
> 
> The RASD describes the guest resources.  When you define a system, you 
> pass a RASD for each resource you want the guest to have.  If you want 
> it to have a disk, you pass in a DiskRASD.  Same thing for proc, mem, 
> network, etc.
> 
> The RASD is then used by the DefineSystem() call to determine what 
> virtual resources to add to the guest. In the case of disk, the DiskRASD 

> tells us the path to the disk we're adding.
> 
> ModifyResourceSettings() works in a similar way.  If a guest has a disk 
> with path /boot/myimage and we want to change it to /boot/not_myimage, 
> we set the Address of the DiskRASD to "/boot/not_myimage" and pass that 
> DiskRASD to ModifyResourceSettings().
> 
> The VSSD is a similar concept, except that it describes the properties 
> of the guest itself.  So, we set the VirtualSystemIdentifier attribute 
> of the VSSD to give the guest a name. This is passed to the 
> DefineSystem() call, so the provider knows what kinds of settings the 
> guest should have.
> 
> ModifySystemSettings() is used to modify the guest's settings.

  Thanks a lot - Kaitlin.
  I'm so grateful for your clear explanation.

 
> 
> -- 
> Kaitlin Rupert
> IBM Linux Technology Center
> kaitlin at linux.vnet.ibm.com
> 
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