[ovirt-users] The host xxx did not satisfy internal filter Memory because its available memory is too low

[Martin Sivak]

> Looks like a bug, the "Max free Memory for scheduling new VMs" in the case
> when we do not have memory optimization must be equal to the free memory on
> the host(minus some small amount of the reserved memory).

This is unfortunately not accurate at all.

Max free Memory for scheduling new VMs takes into account the
theoretically possible maximal memory consumption of all running VMs.
But the Linux kernel and Qemu won't eat all the physical memory
immediately. That is why you can see pretty big difference between
those two numbers (free memory and memory available for new VMs).

For example:

Host 10 GiB of RAM
2 running VMs configured to eat 4GiB of RAM each
but the VMs are not doing anything and really use only 1GiB of RAM each

The result? Max memory for new VMs: 2 GiB, Free memory on the host: 8 GiB


How many VMs are you running on the host? What are their memory allocations?

Best regards

--
Martin Sivak
SLA / oVirt

On Mon, Mar 27, 2017 at 10:57 AM, Artyom Lukianov <alukiano at redhat.com> wrote:
> Looks like a bug, the "Max free Memory for scheduling new VMs" in the case
> when we do not have memory optimization must be equal to the free memory on
> the host(minus some small amount of the reserved memory). Can you please
> provide the screenshot of the host in the engine and also output of the
> command # free -h on the problematic host.
>
> Best Regards
>
> On Sun, Mar 26, 2017 at 6:13 PM, yimao <yiimao.y at gmail.com> wrote:
>>
>> Hi,
>>
>> When I create vm after I have installed ovirt Node 4.1.1 successfully,
>> I got this error message "The host xxxx did not satisfy internal
>> filter Memory because its available memory is too low".
>>
>> I use ovirt node:ovirt-node-ng-installer-ovirt-4.1-2017032304.iso and
>> ovirt-engine-appliance-4.1-20170322.1.el7.centos.noarch.rpm. And I
>> followed the steps in http://www.ovirt.org/node/.
>>
>> I found the informations in  "hosts"->"general"->"info" page:
>> "Max free Memory for scheduling new VMs: 356 MB"
>> "Physical Memory: 15747 MB total, 5039 MB used, 10708 MB free"
>>
>> Why the free memory for scheduling new vms is so little? Is there
>> anything wrong with my configuration?
>>
>> Thanks in advance,
>> Yiimao Yang.
>> _______________________________________________
>> Users mailing list
>> Users at ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>
>
>
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