1. Southwest Tier 2

2. Southwest Tier 2 Computing facility used by the ATLAS experiment
Funded by the National Science Foundation as a subcontract to the U.S. ATLAS Operations program.
A consortium of the University of Texas at Arlington (UTA), University of Oklahoma (OU), and Langston University (LU)
One of four Tier 2 facilities in United States of America
There are forty Tier 2 facilities worldwide

3. Large Hadron Collider
The LHC is a ~17 mile ring crossing between France and Switzerland
Accelerates beams of protons to nearly ( ) the speed of light
Collides the beams at certain locations (ATLAS) for data to be recorded
Current Run II provides 13 TeV collisions/events

4. ATLAS Experiment The size of a seven story building
90+ million data channels
40 million events occur per second
events per second are recorded
4 megabytes per event
2.5 GB/s stored to tape

5. ATLAS Computing Model Tiered Model with Tiers 0, 1 ,2 and 3
Tier 0 is central facility
CERN
Tier 1 is a national facility
Brookhaven National Laboratory (BNL) for the USA
Tier 2 is a regional facility
USA Tier 2's
Northeast Tier 2
ATLAS Great Lakes Tier2
Midwest Tier 2
Southwest Tier 2
Tier 3 is an institutional facility
University or group cluster

6. ATLAS Tier 2 Roles Provides CPU cycles for: User Analysis
Monte Carlo simulations of events
Reprocessing exercises
Provides Storage for:
Physics Data
From recorded collisions
From simulated collisions
User Analysis Results

7. Southwest Tier 2 resources
UTA
UTA_SWT2
Dedicated to simulations
2360 job slots; 130 TB of storage
SWT2_CPB
Performs all tier 2 processing jobs
8736 job slots; 5.5 PB of storage OU
OU_OCHEP
Performs all tier 2 processing jobs
844 job slots
OU_OSCER
Campus cluster provides additional simulation resources
1800 job slots, 500TB Storage
Langston University
LUCILLE
NSF-MRI funded cluster
960 job slots; 110TB of storage

8. Tier 2 Contributions Within ATLAS
This chart show the cumulative contribution of CPU-seconds delivered by Tier 2's for successful processing jobs for the year (1/1 through 10/31)
SWT2 is second largest in ATLAS!

9. SWT2_CPB Supports all ATLAS activities Current Deployed Resources:
20 Gbps external network connection
439 compute nodes
4368 cores / 8736 job slots
At least 2 GB RAM per job slot
32 storage servers
5.5 PB usable storage
1 NFS server
1 admin server
14 grid/service nodes

10. Grid Services Compute Element
GLOBUS based access to local batch system for submitting work
Storage Element
Storage Resource Manager (SRM) access to storage using GridFTP servers (2)
Root Door
Alternative access to storage
Squid caching services
CVMFS (distributed file system for experiment code base)
Calibration data
Monitoring services
NAGIOS
Custom scripts

11. Topology

12. Compute Dell R630 CPU: 2 x Xeon E5-2640 v4 2.4 GHz
Broadwell 10 cores, 20 threads / CPU
RAM: 128 GB , GHz, DDR4
Storage: 2 x 800 GB SSD (RAID-0)
Network:
2 x 10 Gbps (SFP+)
2 x 1 Gbps (Ethernet)

13. Storage MD 3460 Shelf 60 x 8 GB SATA disk
(4 x RAID 6 Disk Groups => 4 x 104 TB exported SAS drives)
4 x 12 Gbps SAS connections
Dell R730
CPU: 2 x Xeon E v4 2.8 GHz
Broadwell 14 cores, 28 threads / CPU
RAM: 256 GB, GHz, DDR4
Network: 4 x 10 Gbps (SFP+), 2 x 1 Gbps (Ethernet)

14. Networking Core: 2 x Dell S6000 (LAG) 32 x 40 Gbps (QFSP+)
TOR: Dell N4032F
24 x 10 Gbps (SFP+)
2 x 40 Gbps (QFSP+)
Legacy: Dell N2048
48 x 1 Gbps (Ethernet)
2 x 10 Gbps (SFP+)

15. Topology (revisited)

16. Conclusions
The Southwest Tier 2 continues to be a valuable resource for the ATLAS experiment
We are helping to enable the discovery of new physics at the LHC
Our contributions will grow as we add more resources
For more information visit