Fimm frontend file system maintenance

Due to a GPFS file system hang on the fimm frontend, for a short period of time (hopefully 10-15 minutes), the frontend will not be available, all users need to log in again after this.

Update, 10:12: fimm frontend needs to be rebooted to clear the hang.
Update, 10:26: fimm frontend is now rebooted and up again.