[Openstack-operators] [openstack-dev] [nova] Default scheduler filters survey

Tim Bell Tim.Bell at cern.ch
Tue May 1 13:10:56 UTC 2018

You may also need something like pre-emptible instances to arrange the clean up of opportunistic VMs when the owner needs his resources back. Some details on the early implementation at http://openstack-in-production.blogspot.fr/2018/02/maximizing-resource-utilization-with.html.

If you're in Vancouver, we'll be having a Forum session on this (https://www.openstack.org/summit/vancouver-2018/summit-schedule/events/21787/pre-emptible-instances-the-way-forward) and notes welcome on the etherpad (https://etherpad.openstack.org/p/YVR18-pre-emptible-instances)

It would be good to find common implementations since this is a common scenario in the academic and research communities.


-----Original Message-----
From: Dave Holland <dh3 at sanger.ac.uk>
Date: Tuesday, 1 May 2018 at 10:40
To: Mathieu Gagné <mgagne at calavera.ca>
Cc: "OpenStack Development Mailing List (not for usage questions)" <openstack-dev at lists.openstack.org>, openstack-operators <openstack-operators at lists.openstack.org>
Subject: Re: [Openstack-operators] [openstack-dev] [nova] Default scheduler filters survey

    On Mon, Apr 30, 2018 at 12:41:21PM -0400, Mathieu Gagné wrote:
    > Weighers for baremetal cells:
    > * ReservedHostForTenantWeigher [7]
    > [7] Used to favor reserved host over non-reserved ones based on project.
    Hello Mathieu,
    we are considering writing something like this, for virtual machines not
    for baremetal. Our use case is that a project buying some compute
    hardware is happy for others to use it, but when the compute "owner"
    wants sole use of it, other projects' instances must be migrated off or
    killed; a scheduler weigher like this might help us to minimise the
    number of instances needing migration or termination at that point.
    Would you be willing to share your source code please?
    ** Dave Holland ** Systems Support -- Informatics Systems Group **
    ** 01223 496923 **    Wellcome Sanger Institute, Hinxton, UK    **
     The Wellcome Sanger Institute is operated by Genome Research 
     Limited, a charity registered in England with number 1021457 and a 
     company registered in England with number 2742969, whose registered 
     office is 215 Euston Road, London, NW1 2BE. 
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