CVMFS

CVMFS works well most of the time, but we do see a lot of instability on various machines. I am simply collecting notes here for trying to understand what is going on.

• CernVM-FS Troubleshooting

CVMFS Reboot

If /cvmfs/cms.cern.ch is not present but /cvmfs/cvmfs-config.cern.ch is, then something went wrong. The following does a hard reboot of CVMFS which has fixed the problem.

sudo service autofs restart && sudo cvmfs_config wipecache

Investigation into why this problem arises is still ongoing.

Static Mount

Due to investigation studying CVMFS Instability, we switched to static-mounting CVMFS repositories within /etc/fstab rather than using autofs. This was done to avoid the periodic CVMFS dropping we were observing and was feasible since our group only uses a handful (~5) of set CVMFS repositories.

EL9 kernels have a patch to autofs that should resolve this dropping issue, so once we update the cluster operating system we can possibly switch back to autofs.