Open Stack

Bummer :(

We have a couple of use cases where I would like this to be transparent and
things to automagically-unicorn and rainbows ;)  Thanks for the insight
Radoslaw!

On Sun, Apr 3, 2022 at 8:12 AM Radosław Piliszek <
radoslaw.piliszek at gmail.com> wrote:

> On Sun, 3 Apr 2022 at 12:46, Laurent Dumont <laurentfdumont at gmail.com>
> wrote:
> >
> > Got it!
> >
> > By quota, do you mean reserved_host_disk_mb in nova.conf? I could make
> the /var/lib/nova/instances RO but I am not sure how that would impact
> config drive that are created locally (since I dont have ceph)
>
> I meant the filesystem quota.
> And yes, this affects config drives.
> Unfortunately, the error message from nova might be confusing.
>
> > Just to be clear on the behavior, this means that boot-from-image
> requests would fail?
> >
> > Looking at nova.conf, I can disable the number of local-disks supported,
> but this doesn't act as a behavior change when the requests are made.
> >
> > I assume, from what I now know, that there is no mechanism to
> default/transform a request to BFV.
> >
> > # A negative number means unlimited. Setting max_local_block_devices
> > # to 0 means that any request that attempts to create a local disk
> > # will fail. This option is meant to limit the number of local discs
> > # (so root local disc that is the result of --image being used, and
> > # any other ephemeral and swap disks). 0 does not mean that images
> > # will be automatically converted to volumes and boot instances from
> > # volumes - it just means that all requests that attempt to create a
> > # local disk will fail.
> > #
> > # Possible values:
> > #
> > # * 0: Creating a local disk is not allowed.
> > # * Negative number: Allows unlimited number of local discs.
> > # * Positive number: Allows only these many number of local discs.
> > #                        (Default value is 3).
> > #  (integer value)
> > #max_local_block_devices = 3
>
> It seems this is actually the best approach (the error message now
> makes sense). Also confirmed by the faq -
>
> https://opendev.org/openstack/nova/src/commit/b0851b0e9c82446aec2ea0317514766fbc53abc0/doc/source/user/block-device-mapping.rst#faqs
>
> -yoctozepto
>
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