Pion-LT (E12-19-006)

h1. JLab Farm Information

Included below is some information and resources regarding working with the PionLT data on the JLab farm.

h2. General Farm Resources

* "JLab SciComp Info Pages":https://scicomp.jlab.org/docs/

** "Tape Storage System Info":https://scicomp.jlab.org/docs/storage

** "Auger batch queueing system":https://scicomp.jlab.org/docs/batch

*** Note, auger will be replaced by Slurm eventually, we're still using auger for now

* "Check Job/Farm Status":https://scicomp.jlab.org/scicomp/index.html#/

h2. Summer 2019 Run Info

The Summer 2019 data was stored alongside the earlier KaonLT data. The  data can be found in -

* /mss/hallc/spring17/raw/ - Raw data for 2019 PionLT run

* /mss/hallc/kaonlt/ - Analysed data

* /volatile/hallc/c-kaonlt/ - Temporary analysed data

Access to these directories is via the "c-comm2017" group

h2. 2021 Run Info

For the 2021 PionLT run, a new group was created, along with numerous new directories -

* New unix group: 'c-pionlt'

* New Farm/Auger project: c-pionlt

** Use this Project name for simulation (and later analysis) jobs on the Farm

* Disk resources:

** /volatile/c-pionlt/ - directory, 6 TB high quota;  2 TB Guarantee

** /group/c-pionlt/ - directory (100GB quota)

*** snapshotted hourly; backed up automatically, use for analysis scripts, etc.

** /work/hallc/c-pionlt/ - directory (1TB quota)

*** NOT backed up in any way

*** Has some small-file/performance benefits (but this doesn't really apply to hcana/podd analysis)

*** Not super useful in a modern workflow (mostly historical), but it's there if you want it.

*** Not intended for rootfile output or to store extra copies of CODA files, etc.

*** Good for large source code bases (that are 'backed up' on an external git repo, for example)

*** OK for modestly sized simulation output perhaps, though /volatile is still best.

** New Tape/disk allocations:

*** /mss/hallc/c-pionlt/raw - tape volume for raw data output

*** /mss/hallc/c-pionlt/analysis - tape volume for analysis output