[ui] requires at least two Ceph-OSD nodes

[Igor Shishkin]

... Independent from defined Ceph object replication factor.

By default replication factor is set to 2, user can define it manually in settings, so desired behaviour is to change "two" to defined replication factor value.

[Dmitry Borodaenko (angdraug)]

The requirement for the number of OSD nodes to be greater or equal than the object replication factor (not just 2) is already accounted for in the following pre-deployment check:

        if osd_count < osd_pool_size:
            raise errors.NotEnoughOsdNodes(
                'Number of OSD nodes (%s) cannot be less than '
                'the Ceph object replication factor (%s)' %
                (osd_count, osd_pool_size))

I am keeping this bug open so that this requirement can be better reflected in the storage settings UI.

[Arminder Singh Girgla (arminder)]

In the Openstack creation wizard, if the user chooses Ceph for images and/or volumes, it should ask for replication factor. Then based on what one chooses, in the GUI, we can show that wherever its hard-coded to two.

[Dmitry Borodaenko (angdraug)]

This was fixed in https://review.openstack.org/62501 that's included in Fuel since version 4.0.