Comment 1 for bug 1735931

Just some additional information - when two disks are provided during deploy, LV is spread across both as expected. It is just adding a block device which does not enlarge LV ^^^

juju ssh cinder/5 "lsblk; sudo vgs; sudo lvs"
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 50G 0 disk
└─sda1 8:1 0 50G 0 part /
sdb 8:16 0 10G 0 disk
├─cinder--volumes-cinder--volumes--pool_tmeta 252:0 0 20M 0 lvm
│ └─cinder--volumes-cinder--volumes--pool 252:2 0 19G 0 lvm
└─cinder--volumes-cinder--volumes--pool_tdata 252:1 0 19G 0 lvm
  └─cinder--volumes-cinder--volumes--pool 252:2 0 19G 0 lvm
sdc 8:32 0 10G 0 disk
└─cinder--volumes-cinder--volumes--pool_tdata 252:1 0 19G 0 lvm
  └─cinder--volumes-cinder--volumes--pool 252:2 0 19G 0 lvm
  VG #PV #LV #SN Attr VSize VFree
  cinder-volumes 2 1 0 wz--n- 19.99g 984.00m
  LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
  cinder-volumes-pool cinder-volumes twi-a-tz-- 18.99g 0.00 0.55