Procedure to recreate the scratch filesystem

There are two steps to recreate the scratch filesystem.

1. Recreate the filesystem structure: Make sure that the following directories exist in the scratch filesystem:

   # Create Nordugrid skeleton. After this, you need to restart ARC services.
   cd /gpfs2
   mkdir -p gridhome/nordugrid-atlas-slurm
   mkdir -p gridhome/wlcg
   
   mkdir -p scratch/tmpdir_slurm
   chmod 1777 scratch/tmpdir_slurm
   mkdir -p scratch/tmpdir_slurm/arc_cache
   mkdir -p scratch/tmpdir_slurm/arc_sessiondir
   mkdir -p scratch/tmpdir_slurm/{cream01.lcg.cscs.ch,cream02.lcg.cscs.ch,cream03.lcg.cscs.ch,cream04.lcg.cscs.ch}
   chmod 1777 scratch/tmpdir_slurm/cream*
   # chown nordugrid-atlas.atlas home/nordugrid-atlas -R
   # chmod 1777 home/nordugrid-atlas/sessiondir

2. Destroy user accounts and all data related to the old grid users existing in the system.

   /opt/cscs/sbin/clean_grid_accounts.bash

3. Run YAIM
4. Set the sticky bit and correct permissions in tmpdir_slurm

   chmod 1777 /gpfs2/scratch/tmpdir_slurm/ 

5. Make it visible for our local scripts

   echo OK > /gpfs2/chk_mount

• /home/nordugrid-atlas --> /gpfs2/gridhome/nordugrid-atlas-slurm/
• /home/nordugrid-atlas-slurm --> /gpfs2/gridhome/nordugrid-atlas-slurm/
• /home/wlcg --> /gpfs2/gridhome/wlcg
• /tmpdir_slurm --> /gpfs2/scratch/tmpdir_slurm