Important locations

• FACET elog: http://physics-elog.slac.stanford.edu/facetelog/
• Important nodes: "rhel6-64.slac.stanford.edu" (general login node) "mcclogin" (node to reach the control servers) "facet-srv01" (control server, which requires access as fphysics@facet-srv01)
• Data storage: /nfs/slac/g/facetdata/nas/nas-li20-pm00 (accessible from, e.g., mcclogin) [eventually mirrored from: /nas/nas-li20-pm00/E320/ (which is accessible from facet-srv20)]
• Data from first run: /u1/facet/matlab/data (you can access e.g., from fphysics@facet-srv20)
• Scopedata: /u1/facet/physics/e320/scopedata/ (copied to /nas/nas-li20-pm00/E320/)
• Attention: one might need to work explicitly in "bash" to use wildcharacters, e.g., : scp -r fphysics@facet-srv01:/u1/facet/physics/e320/scopedata/2021_08_13___22* /afs/slac/u/gu/smeuren/scopedata/

Copying files to your local computer

• Method A: use a bunch of scp to bring data to a node with internet access; then use scp from your local computer to download them. This can cause quota issues though. For details see the sections below.
• Method B (avoiding quota issues):
  • tar the folder that you want to copy [ tar -zcvf file.tar.gz /path/to/dir/]
  • use the script from Control network: little tricks to copy the tar file to your local computer
• Desperate means to download old data:
  • copy the date from /nfs/etc. to a facet server (no quota issues there): (smeuren@mcclogin $ scp -r /nfs/slac/g/facetdata/nas/nas-li20-pm00/E320/2022/20220820/E320_03027/ fphysics@facet-srv20:/home/fphysics/smeuren/)
  • tar the folder on the control computer and use Method B above

Example data analysis procedure (Version A)

1. Go to the FACET elog: http://physics-elog.slac.stanford.edu/facetelog/
2. Find the shift summary with information about the data sets taken, e.g., http://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2021/32/13.08&pos=2021-08-13T06:00:00
3. Determine which run we want to analyze, e.g., http://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2021/32/13.08&pos=2021-08-13T04:50:00
4. (Log into facet-srv20 (you need permission, see FACET Computing): ssh fphysics@facet-srv20 -Y): only needed if the data analysis should be done on the cluster
5. Optional: verify, that you can access the path shown in the elog entry
6. Log into a general SLAC computing note from your own computer, e.g., ssh smeuren@rhel6-64.slac.stanford.edu
7. Get your personal home folder via pwd, e.g., /afs/slac.stanford.edu/u/gu/smeuren
8. Log into mcclogin, e.g., ssh smeuren@mcclogin -Y
9. smeuren@mcclogin $ scp -r fphysics@facet-srv20:/nas/nas-li20-pm00/E305/2021/20210813/E305_00292 /afs/slac/u/gu/smeuren/

Example data analysis procedure (Version B)

Here is how to copy data using the fastx3 webinterface:

Copy the data from fastx3 to your personal computer:

• scp -r smeuren@fastx3.slac.stanford.edu:/afs/slac.stanford.edu/u/gu/smeuren/E320_03872 .

Nodes with access to the internet

1. Log into mcclogin, e.g., ssh smeuren@mcclogin -Y
2. Log into, e.g., ssh smeuren@rhel6-64.slac.stanford.edu -Y
3. start firefox (slow due to x-forwarding)

Read the metadata (matlab) files from python

1. Get access to python (e.g., on facet-srv01): source $PACKAGE_TOP/anaconda/envs/python3.7env/bin/activate On rhel: source /afs/slac/g/lcls/package/anaconda/envs/python3.7env/bin/activate (one might need to explicitly start a bash shell)
2. run python3