> -----Original Message-----
> From: Cory Wright
> Sent: 17 February 2011 20:41
>
> [Snip]
>
> Below are the vm-params from Nova that are different from what we
> (Rackspace) currently use:
>
> Nova:
> Linux:
> platform: {}
The platform flags (acpi, apic, etc) are specific to HVM, and they have no
effect for PV domains, so this is fine.
> PV_args: 'noninteractive'
I think this just applies to our pre-manufactured Debian Etch VM, and really
shouldn't be here. Salvatore, you added this as far as I can tell -- what was
the thinking here?
> Windows:
> platform: {'acpi': 'true', 'apic': 'true',
> 'pae': 'true', 'viridian': 'true'}
These are "good enough", but ideally we'd set these on a per-OS basis.
XenServer sets these using the appropriate template to match the OS that's
going to be installed, so you can see what differences there might be by
listing our templates and getting the recommended set of flags. Most of the
time, this set is fine, but you might see performance degradation on older
versions of Windows if you don't match what we do in the appropriate XenServer
template.
We currently don't have anywhere to put these flags, so we end up with this
hardcoded list. It would be good to improve this. We could figure out a
scheme whereby some metadata in Glance (e.g. an OS hint) turned into the
appropriate HVM platform flags. This would then allow you to configure which
OSes have NX turned on, etc. Is this something that you want to tackle, Cory?
> Both:
> other_config: {}
> user_version: '0'
These are the defaults, so it makes no difference specifying them.
> Also, we supply the following vm-params to all instances when booting
> but they are not currently used in Nova.
>
> ha_always_run: true,
This says, "if the VM shuts down, for whatever reason, then immediately start
it again". I presume this isn't what you want, but I presume that it isn't
taking effect because you don't have HA turned on. If my assumptions are
correct, then I'd set this to false, for clarity.
> blocked_operations: {}
> ha_restart_priority: ""
> tags: []
> xenstore_data: {},
All four are the default, so no effect.
Cheers,
Ewan.
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