I believe this is fixed in v2.3.1.
This is from NEWS:
-- Do not treat the absence of a gres.conf file as a fatal error on systems
configured with GRES, but set GRES counts to zero.
Quoting [email protected]:
> A user has reported the following problem on 2.2.7. If gpu resources are
> enabled in slurm.conf (GresTypes=gpu) slurmd will not start on nodes that
> do not define a gpu resource in their local gres.conf file. A reported
> workaround is to define a bogus gpu resource in gres.conf, but hide it
> from users by not defining it in the node properties in slurm.conf.
> I have not tried to reproduce the problem on 2.3.5 or 2.4.0-rc1. Someone
> suggested that this problem has been fixed, but I didn't see any notice of
> that in the NEWS file.
>
> Regards,
> Martin
>
