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On Wed, Apr 25, 2018 at 9:14 AM, Dmitry Tantsur <dtantsur at redhat.com> wrote:

> Hi all,
>
> I'd like to restart conversation on enabling node automated cleaning by
> default for the undercloud. This process wipes partitioning tables
> (optionally, all the data) from overcloud nodes each time they move to
> "available" state (i.e. on initial enrolling and after each tear down).
>
> We have had it disabled for a few reasons:
> - it was not possible to skip time-consuming wiping if data from disks
> - the way our workflows used to work required going between manageable and
> available steps several times
>
> However, having cleaning disabled has several issues:
> - a configdrive left from a previous deployment may confuse cloud-init
> - a bootable partition left from a previous deployment may take precedence
> in some BIOS
> - an UEFI boot partition left from a previous deployment is likely to
> confuse UEFI firmware
> - apparently ceph does not work correctly without cleaning (I'll defer to
> the storage team to comment)
>

Yes, ceph-disk [1] won't prepare a disk that isn't clean. Deployers new to
Ceph may not realize this and deployment tools which trigger ceph-disk will
fail to prepare the requested OSDs. It may take the deployer time to
realize that is the cause of failure and then they usually enable Ironic's
automated cleaning.


> For these reasons we don't recommend having cleaning disabled, and I
> propose to re-enable it.
>
> It has the following drawbacks:
> - The default workflow will require another node boot, thus becoming
> several minutes longer (incl. the CI)
> - It will no longer be possible to easily restore a deleted overcloud node.
>
> What do you think? If I don't hear principal objections, I'll prepare a
> patch in the coming days.
>

+1

  John

[1] http://docs.ceph.com/docs/hammer/man/8/ceph-disk/



>
> Dmitry
>
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