[ovirt-users] Feature: Maximum memory size | BUG

[Michal Skrivanek]

> On 26 Jul 2017, at 14:59, Ladislav Humenik <ladislav.humenik at 1und1.de> wrote:
> 
> Hallo, after engine update to 4.1.2 from 4.0.6 we have following bug
> 
> *Your Future Description: *
> 
> Maximum memory value is stored in |VmBase.maxMemorySizeMb| property. It is validated against range [/memory of VM/, /*MaxMemorySizeInMB/], where /*MaxMemorySizeInMB/ is one of |VM32BitMaxMemorySizeInMB|, |VM64BitMaxMemorySizeInMB| and |VMPpc64BitMaxMemorySizeInMB| configuration options depending on selected operating system of the VM. Default value in webadmin UI is 4x size of memory.
> 
> During migration of engine 4.0 -> 4.1 all VM-like entities will get max memory = 4x memory.
> 
> If a VM (or template) is imported (from export domain, snapshot, external system) and doesn't have max memory set yet, the maximum value of max memory is set (|*MaxMemorySizeInMB| config options).
> 
> *Our engine settings:*
> [root at ovirt]# engine-config -g VM64BitMaxMemorySizeInMB
> VM64BitMaxMemorySizeInMB: 8388608 version: 4.1
> VM64BitMaxMemorySizeInMB: 8388608 version: 3.6
> VM64BitMaxMemorySizeInMB: 8388608 version: 4.0
> [root at ovirt# engine-config -g VM32BitMaxMemorySizeInMB
> VM32BitMaxMemorySizeInMB: 20480 version: general
> 
> *Template:
> *engine=# select vm_guid,vm_name,mem_size_mb,max_memory_size_mb from vm_static where vm_name LIKE 'Blank';
>               vm_guid                | vm_name | mem_size_mb | max_memory_size_mb
> --------------------------------------+---------+-------------+--------------------
> 00000000-0000-0000-0000-000000000000 | Blank   |        8192 |              32768
> (1 row)
> 
> *Created VM*
> - expected is mem_size_mb * VM64BitMaxMemorySizeInMB
> - we get mem_size_mb * 4 (default)
> 
> *Engine: *engine=# select vm_guid,vm_name,mem_size_mb,max_memory_size_mb from vm_static where vm_name LIKE 'vm-hotplug%';
>               vm_guid                |   vm_name   | mem_size_mb | max_memory_size_mb
> --------------------------------------+-------------+-------------+--------------------
> 254a0c61-3c0a-41e7-a2ec-5f77cabbe533 | vm-hotplug  |        1024 |               4096
> c0794a03-58ba-4e68-8f43-e0320032830c | vm-hotplug2 |        3072 |              12288
> (2 rows)
> 
> *Question:*
> It is possible to change this (default * 4) behavior in DB??

Hi,
no, not really, it’s just a UI-side default suggestion.
In API you supply it yourself in the request, any value you would want. It just limits the max hotpluggable amount of memory

Thanks,
michal

> 
> Kind Regards,
> Ladislav Humenik, System administrator
> 
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