Specific directions on accessing and using the Collum-Loring-Abruna-Widom ( CLAW ) cluster
Nodes are not shared between groups, by default
By default, each group can only use their group's compute nodes.
- This is enforced technically.
- Command-line: Applies to all groups
- WebMO (GUI access): Currently applies only to the Collum group (as of 11/4/16).
- Q: Can WebMO be used by any other group to access only their group's nodes?
- Faculty members may create social agreements to permit cross-group access of nodes.
- This increases group member's responsibility not to abuse any nodes they are guests to.
- Chemistry IT staff are hopeful that the default restrictions can be modified to enable desired degree of sharing.
Exceptions to isolated nodes
The following groups are sharing nodes:
Widom's nodes are available to the Collum group.
Widom and Loring share each other's nodes. To clarify:
- Collum group may not use Loring's nodes.
- And Loring's group may not use Collum's nodes.
Table with summary information
| Group | Group's nodes And software licensed. | Access to other groups' nodes (assume access to own group's nodes, naturally) | WebMO data (GB) | Current users' data (GB) | Inactive users' data (GB) | Back-up? (EZ-Backup) | Back-in-Time versioning | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Collum | 8 compute nodes. Maybe 1 more (former head node). Has paid for WebMO | Widom (Collum group paid to add hard drives to all 7 of Widom's compute nodes. 12TB (= 6TB * 2) hard drive space now available on each of Widom's nodes.) | Yes | No | ||||||||
| Abruna | Has paid for Gaussian | n/a | n/a | ~500 (11/11/16) | No | No | ||||||
| Loring | 5 compute nodes. Oldest nodes on the cluster. | Widom | n/a | No | No | |||||||
| Widom | Widom contributing the current head node. 8 compute nodes.
| Loring Special queue* | n/a | No | No | |||||||
| SLin | (SLin currently has no compute nodes) |
Widom | n/a | No | No |
|
*Special queue: Queue was created and for use by a single member of Widom's group to enable their research without consuming 100% of Widom's nodes.
- To be used only for single-core jobs, which is a social expectation and not technically enforceable.
- Allows for stacking of many, many single-core jobs, and is limited to consuming up to 6 of Widom's 7 compute nodes.
Questions and known issues
Q: Enable WebMO for groups other than Collum? If so, add column with nodes enabled.
Know issues:
Q: How do we prevent individual from bringing shared head node to its needs by running an application directly on the head node, instead of using queues?
- Widom contributing
Future addition, hopefully:
- Abruna (n nodes as some of his 10 nodes might be used for testing CAC setup)
Guest groups using cluster under the auspices of a cluster sponsoring group(s):
- Song Lin ( 0 nodes )