Legion Architecture

Node Types

• Login Nodes
• Transfer Node
• Compute Nodes
• (Infrastructure Nodes)

Login Nodes

For:

• Access
• Programming
• File transfers (light)
• Testing (light)
• Visualisation (light)

Accessible via ssh, at legion.rc.ucl.ac.uk, or login0(6-9).external.legion.ucl.ac.uk.

Transfer Node

At login05.external.legion.ucl.ac.uk.

Can transfer data around Legion up to 10⨉ faster than normal login nodes.

Compute Nodes

• only accessible via the scheduler
• intended for all significant non-interactive work
• can also do limited interactive work
• can access external networks

Numbers and Types

Type	Cores	RAM	Network	Number	Total Cores
T	32	1.5TB	Ethernet	6	192
U	16	64GB	Infiniband	160	2496
V	12	48GB	Ethernet	8	96+GPU
X	12	24GB	Infiniband	144	1728
Y	12	24GB	Ethernet	108	1296
Z	12	48GB	Ethernet	4	48

Topology

Filesystem Access