Panorama periodically performs a file system integrity check (FSCK) to prevent corruption of the Panorama system files. This check occurs after eight reboots or at a reboot that occurs 90 days after the last FSCK was executed. If Panorama is running a FSCK, the web interface and Secure Shell (SSH) login screens will display a warning to indicate that an FSCK is in progress. You cannot log in until this process completes. The time to complete this process varies by the size of the storage system; depending on the size, it can take several hours before you can log back in to Panorama.