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

[Jakub Niedermertl]

Hello Ladislav,

the function computing size of default maximum memory size is currently not
configurable from DB.

If you want it to be so please feel free to file an RFE [1].

[1]: https://bugzilla.redhat.com/enter_bug.cgi?product=ovirt-engine

Best regards,
Jakub

On Wed, Jul 26, 2017 at 1:59 PM, 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??
>
> Kind Regards,
> Ladislav Humenik, System administrator
>
>
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