Thank you Tina, I hadn't realised that would show as "n/a" not "down" in that case (which IMO would have been confusing). For anyone else hitting this I think the minimum you can do is something like:
PartitionName=compute Default=YES <options> State=UP Nodes=nosuch NodeName=nosuch The documented approach would have been easier in my case given the constraints of the template logic generating this but at least it's a workaround. thanks Steve http://stackhpc.com/ Please note I work Tuesday to Friday. On 18/12/2020 12:45:26, Tina Friedrich wrote: > Yeah, I had that problem as well (trying to set up a partition that > didn't have any nodes - they're not here yet). I figured that one can have > partitions with nodes that don't exist, > though. As in, not even in DNS. I currently have this: [arc-slurm ~]$ sinfo > PARTITION AVAIL TIMELIMIT NODES STATE NODELIST > short up 12:00:00 1 down* arc-c023 > short up 12:00:00 1 alloc arc-c001 > short up 12:00:00 43 idle arc-c[002-022,024-045] > medium up 2-00:00:00 0 n/a > long* up infinite 0 n/a with medium & long partition > containing nodes 'arc-c[046-297]': PartitionName=medium > AllowGroups=ALL AllowAccounts=ALL AllowQos=ALL > AllocNodes=ALL Default=NO QoS=N/A > DefaultTime=12:00:00 DisableRootJobs=NO ExclusiveUser=NO GraceTime=0 > Hidden=NO > MaxNodes=UNLIMITED MaxTime=2-00:00:00 MinNodes=0 LLN=NO > MaxCPUsPerNode=UNLIMITED > Nodes=arc-c[046-297]... which don't exist as of today: [arc-slurm ~]$ > host arc-c046 > Host arc-c046 not found: 3(NXDOMAIN) which - as you can see - simply ends > up with SLURM showing the partition > with no nodes. So you could just put a dummy nodename in the slurm.conf > file? Tina On Fri, 18 Dec 2020 at 11:13, Steve Brasier <ste...@stackhpc.com> wrote: > Having tried just not even defining any partitions you hit this this > <https://github.com/SchedMD/slurm/blob/master/src/common/node_conf.c#L383>check > which seems to ensure you can't create a cluster with no nodes. Is it > possible to create a control node without any compute nodes, e.g. as part > of a staged deployment? > > http://stackhpc.com/ > Please note I work Tuesday to Friday. > > > On Fri, 18 Dec 2020 at 10:56, Steve Brasier <ste...@stackhpc.com> wrote: > >> Hi all, >> >> According to the relevant manpage >> <https://slurm.schedmd.com/archive/slurm-20.02.5/slurm.conf.html> it's >> possible to define an empty partition using "Nodes= ". >> >> However this doesn't seem to work (slurm 20.2.05): >> >> [centos@testohpc-login-0 ~]$ grep -n Partition /etc/slurm/slurm.conf >> 72:PriorityWeightPartition=1000 >> 105:PartitionName=compute Default=YES MaxTime=86400 State=UP Nodes= >> >> (note there is a space after that final "=" but I've tried both with and >> without) >> >> [centos@testohpc-login-0 ~]$ sinfo >> sinfo: error: Parse error in file /etc/slurm/slurm.conf line 105: " >> Nodes= " >> sinfo: fatal: Unable to process configuration file >> >> Is this a bug, or am I doing it wrong? >> >> thanks for any suggestions >> >> Steve >> >> http://stackhpc.com/ >> Please note I work Tuesday to Friday. >> >
