Comment 7 for bug 809221

The Ceph device string can be (EBNF off the top of my head)

address = ip | hostname
mon = address [ ":" port ]
mons = mon [ "," mons ]
dev = mons ":" path

For example:

1.2.3.4:/
1.2.3.4:/foo
1.2.3.4:6789:/foo
1.2.3.4,2.3.4.5:/foo
1.2.3.4:6789,2.3.4.5:/foo
1.2.3.4:6789,2.3.4.5:6789:/foo

path always begins with a slash.

And there's IPv6 support in there too.

But really, mountall should treat dev as an opaque string until proven otherwise (is_remote gives false, etc).