[nova] local LVM volume on compute hosts

Paul Harrison paul.harrison at manchester.ac.uk
Wed Jun 8 07:26:34 UTC 2022

> On 2022-06 -07, at 13:25, Sean Mooney <smooney at redhat.com> wrote:
> no there is noting else you need to configure but this option is not what you think it is.
> the images_type option contols what storage will be used for all non cinder storage.
> i.e. vms that are booted with out usign a boot volume.
> by default i belive we woudl use qcow or raw files on disk
> with images_type=lvm we will instead create a lvm volume for the root disk but only if you do not use the boot form volume workflow.
> there is no way curretnly to prevent usign boot form volume on a specific host and force only local storage directly via config.
> you can do this indirectly but with sideffect.
> effectivly if you have a set of hosts that cant or should not have acess to cinder you can create a spereate avaiablity zone.
> you would then set [cinder]/cross_az_attch=false. e.g. create local-only az and if the cinder backend is configured to be in a differnt az then
> the cross_az_attach config will prevent the vm form booting in the local-only az.
> https://docs.openstack.org/nova/latest/configuration/config.html#cinder.cross_az_attach <https://docs.openstack.org/nova/latest/configuration/config.html#cinder.cross_az_attach>
> so your current config will make any non boot from volume nova instance use lvm storage to provision the vm root/swap/epmeral disks
> but will not prevent end users requesting cinder data voluems or boot volumes via the cli/api. if the opt in to cinder stoage that
> is what they will recive but if they use teh default storage provided by the flaovr then it will be local.

thanks for the explanation - it is a shame that there is not a more direct way in config to force local storage - looks like https://blueprints.launchpad.net/nova/+spec/use-libvirt-storage-pools <https://blueprints.launchpad.net/nova/+spec/use-libvirt-storage-pools> has never got enough votes for implementation.

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