Comment 2 for bug 1783084

This looks like a maas issue - the error message comes from maas. Juju is simply asking for a machine with 2 storage devices, each tagged "optane"; in this case the default size for each pool would be 1GiB as I don't think the charm specifies a default storage size. The storage constraint passed to maas is:

root:0,6:1(optane),7:1(optane),8:1(ssd)

This corresponds to asking for 1 disk from the osd-devices pool (tagged ssd) and 2 disks from the bluestore pool (tagged optane), and a default sized root disk.

You'd need to look at the maas logs to see why the request could not be satisfied.