Re: [Xen-API] exception MEMORY_CONSTRAINT_VIOLATION

[Jonathan Knowles <jonathan.knowles@xxxxxxxxxxxxx>]

Marco Sinhoreli wrote:
> I'm using the python xenapi. Above the source code for setup VM memory
> dynamic and static:
>
> <code>
> [...]
> # Configuring the VM memory
> memory_size = str(memory_size * 1024 * 1024)
> self.master.VM.set_memory_dynamic_max(vm, memory_size)
> self.master.VM.set_memory_dynamic_min(vm, memory_size)
> self.master.VM.set_memory_static_max(vm, memory_size)
> self.master.VM.set_memory_static_min(vm, memory_size)
> [...]
> </code>
Okay, I think I can see the problem here.

XAPI rejects any API calls that would violate the following
constraint:

    static-min <= dynamic-min <= dynamic-max <= static-max

The section of code you've posted above makes four separate API
calls to update memory properties. XAPI will raise an exception
if any one of those four calls violate the above constraint. To
update memory properties in this way, you'd need to be careful
with the order in which you make the calls...

I recommend instead using the set-memory-limits function, which
allows you to update these four values atomically.

Marco, could you try replacing the above code with:

> <code>
> [...]
> # Configuring the VM memory
> memory_size = str(memory_size * 1024 * 1024)
> self.master.VM.set_memory_limits(vm, 
>     memory_size, memory_size, memory_size, memory_size)
> [...]
> </code>
And let me know if that works?

Best wishes

Jonathan Knowles

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