I'm experiencing a weird problem with an external USB HDD, which I use for backups:
I realized some days ago, that the backup tasks broke down. OMV flagged the backup filesystem on my USB HDD as "missing". I've detached the USB HDD from the server and reattached it again. It apparently had issues. At least, I was not able to mount it, neither through OMV, nor manually via the CLI. Using fsck I was able to repair the filesystem. At least I was able to mount it manually again afterwards. Scanning through the directories the data looked ok. At this stage I unmounted the drive again and tried to reintegrate it into the OMV environment. I started removing all references to the old mount point, in rsync in the SMB shares. I finally removed the old mount point itself and applied all changes. When I look into the discs I see the device (/dev/sdj) as "unmounted". If I go to filesystems I select /dev/sdj1 and use the "play" button to mount an existing filesystem. A window pops up asking me about the filesystem to mount. However, the drop-down list to select the (existing) filesystem is empty.
I assume that the HDD crashed at some stage. As I can mount it manually, I don't think it is broken though. I'm not sure whether this an inconsistency in the configuration. In any case, any ideas to mount the HDD or to debug the problem further, will be appreciated.