[DRBD-user] Linstor: consistency of device node numbers

[Brian Candler]

On 12/02/2021 18:34, Brian Candler wrote:
> In my testing, Linstor seems to create the same device node name on 
> each node (e.g. `/dev/drbd1000`).
>
> My question is: is this guaranteed?  e.g. is the drbd node number a 
> unique, global property of the volume itself? 

I think I've answered my own question here:

root at node1:~# linstor volume-definition list -p
+---------------------------------------------------------------+
| ResourceName | VolumeNr | VolumeMinor | Size  | Gross | State |
|===============================================================|
| my_ssd_res   | 0        | 1000        | 1 GiB |       | ok |
| res00        | 0        | 1001        | 1 GiB |       | ok |
| res00        | 1        | 1002        | 2 GiB |       | ok |
+---------------------------------------------------------------+

The VolumeMinor appears to be a property of the (Resource+Volume), so I 
think it should be stable and consistent across all nodes where that 
resource appears.  I was confused because "linstor volume list" shows 
the VolumeMinor separately for each node.

(It's taking me a while to get my head around the relationship between 
resource-groups, resource-definitions, resources, volume-groups, 
volume-definitions, and volumes!)

Regards,

Brian.