Comment 8 for bug 2071875

Hi Sam,

you referred to upgrading Ceph from octopus to pacific above. To do this you will need to first upgrade the charms. Charms are always backward compatible with at least the last release, ie. you can always run charm release N and Ceph release N-1

Here is some documentation around the upgrade order:

https://static.openstack.org/docs/project-deploy-guide/charm-deployment-guide/yoga/upgrade-overview.html#upgrade-order

There's no code difference between stable/21.10 and stable/octopus for the ceph-osd charm (however from a maintenance perspective the difference is that stable/octopus would receive bug fixes, while stable/21.10 is unmaintained as it's EOL).