[one-users] FREEMEMORY as RANK variable

[Carlos Martín Sánchez]

Here's is a quick improvement in the docs:

https://github.com/OpenNebula/docs/blob/master/source/user/references/template.rst#predefined-host-attributes

Regards.

--
Carlos Martín, MSc
Project Engineer
OpenNebula - Flexible Enterprise Cloud Made Simple
www.OpenNebula.org | cmartin at opennebula.org | @OpenNebula
<http://twitter.com/opennebula> <cmartin at opennebula.org>

On Fri, Oct 24, 2014 at 4:40 PM, Carlos Martín Sánchez <
cmartin at opennebula.org> wrote:

> Hi Steven,
>
> On Sat, Oct 11, 2014 at 6:05 AM, Steven C Timm <timm at fnal.gov> wrote:
>
>>  During most of the time we have been running OpenNebula 2 and 3 we have
>> been using a
>> rank based on FREEMEMORY.  We are now doing tests using OpenNebula 4.8,
>> in a use case
>> where we are filling up an empty cloud.  FREEMEMORY still in theory
>> should be an accurate value
>>
>
> FREEMEMORY hasn't been a Host attribute for a few versions. I can't
> remember exactly when it was removed, but it is not part of the host now.
>
> The predefined variables you can use in the rank or requirements are [1]:
>
> NAME
> MAX_CPU
> MAX_MEM
> FREE_MEM
> FREE_CPU
> USED_MEM
> USED_CPU
> HYPERVISOR
>
> By the way, I see this list is buried too deep in the docs, so I'll try to
> move it to a new section and explain each attribute.
>
>
>> but the problem is that 6-7 VM's are typically being launched on every
>> SCHED cycle and so a
>> node that starts out with all of its memory free will end up full of
>> virtual machines in a single cycle.
>>
>>  Once we got to a full cloud and steady-state it would be fine but when
>> you have 8 VM's
>> starting at once on an old 8-core node, it takes much longer than it
>> otherwise would.
>>
>>  Any cheap suggestions to get the default scheduler to do a more
>> horizontal fill?
>>
>>  Steve Timm
>>
>
> In /etc/one/sched.conf [2] you can set MAX_HOST to 1. This forces the
> scheduler to launch one VM to each host per cycle. Combined with the
> SCHED_INTERVAL, you can configure a slower deployment rate.
>
> Best regards,
> Carlos.
>
> [1]
> http://docs.opennebula.org/4.8/user/references/template.html#requirement-expression-syntax
> [2] http://docs.opennebula.org/4.8/administration/references/schg.html
> --
> Carlos Martín, MSc
> Project Engineer
> OpenNebula - Flexible Enterprise Cloud Made Simple
> www.OpenNebula.org <http://www.opennebula.org/> | cmartin at opennebula.org
>  | @OpenNebula <http://twitter.com/opennebula> <cmartin at opennebula.org>
>
>
>
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