Rancher 2.0 + Longhorn: Multiple disk

Hello.
Does anyone use the longhorn(https://github.com/rancher/longhorn)?

I have 2 disks: Disk /dev/dva and Disk /dev/vdb, but right now longhorn uses only /dev/dva. I’d like to use /dev/vdb, but I do not know how to do that.

fdisk -l
Disk /dev/vda: 46.6 GiB, 50000000000 bytes, 97656250 sectors
Disk /dev/vdb: 46.6 GiB, 50000000000 bytes, 97656250 sectors
df -h
/dev/vda1 46G   21G   23G  49% /
/dev/vdb  46G   52M   44G   1% /srv

I found the driver(https://github.com/rancher/longhorn-manager/blob/master/driver/longhorn#L17), but I could not use it

root@node-2:/var/lib/kubelet/volumeplugins/rancher.io~longhorn# ./longhorn mount /srv
{"status": "Failure", "message": "Device /dev/longhorn/ is already existed"}

and also I found PR longhorn-manager/pull/100 and I think this will help me in the future.

Can anyone help me?

longhorn v0.3 has already support multiple disk scheduling, please try it.