Question about PFS default partition choice on mount

[George]

Hi guys,

I have a question on how to manage partitions with the DragonFly and
Hammer2.

My goal is to replicate a ZFS I had with FreeBSD so I would like to
create individual PFSes for all my NFS exports so I can manage storage,
snapshots, backups etc at that level.

I installed 5.4.2 and choose to leave everything in the partition the
same with the exception of making / 100GB and /build 100GB and
dedicating the rest of my large disk to /exp so I ended up with:

df -h:
Filesystem                     Size   Used  Avail Capacity  Mounted on
serno/ZAD2RVKD.s1d            99.3G   637M  98.7G     1%    /
devfs                         1024B  1024B     0B   100%    /dev
/dev/serno/ZAD2RVKD.s1a       1022M   186M   754M    20%    /boot
/dev/serno/ZAD2RVKD.s1e at DATA  99.3G  3072K  99.3G     0%    /build
/dev/serno/ZAD2RVKD.s1f at DATA  5303G  64.0K  5303G     0%    /exp
/build/usr.obj                99.3G  3072K  99.3G     0%    /usr/obj
/build/var.crash              99.3G  3072K  99.3G     0%    /var/crash
/build/var.cache              99.3G  3072K  99.3G     0%    /var/cache
/build/var.spool              99.3G  3072K  99.3G     0%    /var/spool
/build/var.log                99.3G  3072K  99.3G     0%    /var/log
/build/var.tmp                99.3G  3072K  99.3G     0%    /var/tmp
tmpfs                         1926M     0B  1926M     0%    /tmp
procfs                        4096B  4096B     0B   100%    /proc

I created myself a PFS like so:

h2 pfs-create exp-backup

hammer2 pfs-list
Type        ClusterId (pfs_clid)                 Label
MASTER      0cbef96e-685a-11e9-8a8c-55bf647a66bb exp-backup
MASTER      5ce0575e-6839-11e9-86d4-55bf647a66bb ROOT
MASTER      5ce056a8-6839-11e9-86d4-55bf647a66bb LOCAL

... and then tried to mount it into my large partition allocation which
fails with 'Invalid arguement' because the PFS label is not found

mount_hammer2 /dev/serno/ZAD2RVKD.s1f at DATA@exp-backup /exp/backup/
mount: : Invalid argument

ls /dev/serno/
ZAD2RVKD	ZAD2RVKD.s1	ZAD2RVKD.s1a
ZAD2RVKD.s1b	ZAD2RVKD.s1d	ZAD2RVKD.s1e	ZAD2RVKD.s1f

I am about to reinstall and put my /exp partition right after root
and /build last and see if then I can mount in the larger partition as
I want, but was wondering if there is something else I can do to end-up
with a PFS being mounted on the right partition.

Thanks in advance!
George