Special use

Our cluster combines various hardware resources from multiple universities and other organizations. By default you can only use the production nodes (see the resources page of the portal).

All tolerations

Here’s the full list of taints on the nodes. Some are set automatically on deployed jobs, some can only be used by privileged users. Please refer to this list and don’t set the ones you’re not allowed to use.

Taint Purpose Normal users can set manually
nautilus.io/bafna=true:NoSchedule Private Vineet Bafna’s node. No
nautilus.io/ceph=true:NoSchedule Don’t run any user jobs on ceph storage nodes No
nautilus.io/ece=true:NoSchedule Private Dinesh Bharadia nodes No
nautilus.io/haosu=true:NoSchedule Private Hao Su cluster. No
nautilus.io/large-gpu=true:NoSchedule Node accepts 4- and 8-GPU jobs only. Set automatically. No
nautilus.io/noceph=true:NoSchedule Ceph is not working on the node. Otherwise the node is fine. Yes
nautilus.io/science-dmz=true:NoSchedule Node can only access the science DMZ network, and not the public Internet. Yes
nautilus.io/stashcache=true:NoSchedule Private OSG nodes No
nautilus.io/testing=true:NoSchedule Node is broken No
nautilus.io/oldkernel=true:NoSchedule Kernel is below v4 Yes
nvidia.com/gpu=Exists:PreferNoSchedule Fence GPU nods from CPU jobs (Preferred! Jobs can still go on the node if there are no free CPU nodes) No

Priorities in group namespaces

Our cluster contains several sets of nodes dedicated to certain groups. All nodes of group group1 are labelled with nautilus.io/group=group1 and some are tainted with nautilus.io/group1=true:NoSchedule.

For such group’s namespaces the pods will be automatically changed to have the corresponding toleration to be scheduled on such nodes. If user is targeting ONLY THE GROUP NODES by using the nodeAffinity such as:

        - matchExpressions:
          - key: nautilus.io/group
            operator: In
            - group1

the pods will also automatically get the higher non-preemtible owner-no-preempt (+10) priority. This means such pods will have priority for scheduling on ALL group nodes (tainted and untainted on the image above). General users have lower priority on untainted nodes and not able to run on tainted nodes.

Non-preemtible priority means that the lower priority pods will not be killed right away when the higher-priority pod appears, but higher priority will be considered when choosing candidate pods for a free resource.

CHASE-CI tolerations

If your project is related to one of these persons:

Ken Kreutz-Delgado Tajana Simunic Rosing Amit K. Roy Chowdhury Walid Najjar
Nikil Dutt Trevor Darrell Lise Getoor Anshul Kundaje
Gary Cottrell Frank Wuerthwein Hao Su Dinesh Bharadia
YangQuan Chen Jeff Krichmar Charless Fowlkes Padhraic Smyth
James Demmel Yisong Yue Shawfeng Dong Rajesh Gupta
Todd Hylton Falko Kuester Jurgen Schulze Arun Kumar
Ron Dror Ravi Ramamoorthi John Sheppard Nuno Vasconcelos
Ramakrishna Akella Manmohan Chandraker Baris Aksanli Dimitris Achlioptas
Ilkay Altintas Brad Smith Christopher Paolini Jerry Sheehan

, which means you’ve specified the person as a PI in the namespace description, it will also be assigned to nodes tainted as Chase-CI (“chaseci”). This will give you more GPU nodes and shorter wait time.


Current installation of Xilinx FPGAs require running nodes with an older kernel. Those nodes require the nautilus.io/oldkernel toleration:

  - key: "nautilus.io/oldkernel"
    operator: "Exists"
    effect: "NoSchedule"

Other tolerations

Some nodes in the cluster don’t have access to public Internet, and can only access educational network. They still can pull images from Docker Hub using a proxy.

If your workload is not using the public Internet resources, you might tolerate the nautilus.io/science-dmz and get access to additional nodes.