the file "volhdr" which is about 1KB in size, among other information, contains the volume label. You may see it in the text if you open the file with an editor. This file will be created/updated if the media is (re-)labeled. As the file is missing, it seems as if it (and probably the whole array of subdirectories or even the whole path) has been deleted. If this is not the case, please check what/where the directory "... might have gone." . If you detect another path where it might be, just correct the device properties or even delete/recreate the device. But for no reason - DO NOT LABEL THE VOLUME! May I suggest you briefly test/verify the procedure with another new device before you switch to the 'hot' one. Good luck.  
Hi everyone,   I upgraded Networker from 9.1.1.7 to 19.4.0.1 (last version) following manual of upgrading but after i done it gives me error that   Volume belonging to the device 'metadata100' is not available Information about the Disk Volume that gives this error: Mode : appendable media type: adv_file Media Pool Type: Backup   i think i forgot to do a command or something before upgrade process? If anyone can help i will appreciate this.
Volume belonging to the device 'metadata' is not available