[DRBD-user] Why to specify node type?

[kvaps]

Hi Robert,

thanks for explanation, now I understand!

Could you also confirm that multiple controllers currently are not supported?

And what type of nodes should I actually use for test swordfish and
NVMEoF? Currently I have following error, when I try to create new
swordfish_target:

    The current node type 'SATELLITE' does not support the storage
driver 'SWORDFISH_TARGET'.

Regards

- kvaps

On Mon, May 13, 2019 at 11:27 AM Robert Altnoeder
<robert.altnoeder at linbit.com> wrote:
>
> On 5/11/19 8:45 PM, kvaps wrote:
> > Hi, I still not get in why do we need to create special types of nodes
> > in linstor, and do we need it?
> >
> > As can I see linstor supports next types of the nodes:
> >
> >  - Controller
> >  - Auxiliary
> >  - Combined
> >  - Satellite
>
> When LINSTOR was originally designed, it was considered an option that
> multiple controllers would be running in an active-passive configuration
> using their own cluster protocol, and if the active controller failed,
> LINSTOR would execute a failover autonomously. For that reason, the
> system had to know what the controller nodes are.
>
> Satellites are nodes that the active controller needs to connect to.
>
> Combined nodes are nodes that run a controller and a satellite process,
> so a controller will still connect to those nodes' satellite software,
> but it would also be aware of the available controller software on such
> a node.
>
> Auxiliary nodes are nodes that do not run any LINSTOR software, but may
> run e.g. DRBD, so resources may be assigned to such nodes using LINSTOR,
> and the controller would be able to generate e.g. DRBD configuration
> files for the node, but the actual work on the node would have to be
> done manually or by means of some other kind of software.
>
> In the current implementation, the only nodes that the system really
> needs to know about are the satellite nodes. The other node types can
> still be used as a convenience option for administrators, so they can
> look up which ones of their nodes have what kind of software installed.
>
> br,
> Robert
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