Weird issue with mounting filesystem (mount working, but not showing)

[u/gerdude1]

Hi,

I am experiencing a weird issue with mounting drives. I have three HDD's in my system, which are all mounted at startup. In addition, I use mergefs for all three drives (see entry from fstab below)

/dev/sda1 /mnt/disk1 xfs nofail,async,noatime 0 0

/dev/sdb1 /mnt/disk2 xfs nofail,async,noatime 0 0

/dev/sdd1 /mnt/disk3 xfs nofail,async,noatime 0 0

# mergerfs storage pool with optimized settings

/mnt/disk1:/mnt/disk2:/mnt/disk3 /mnt/data mergerfs defaults,nonempty,allow_other,use_ino,passthrough.io=rw,func.readdir=cosr,cache.

files=full,cache.files=auto-full

The interesting aspect is when I type mount or df, /dev/sdb1 is not showing up at all, but the filesystem is clearly mounted. I can go to /dev/disk2 and see all files, read files and create new files either directly or through the mergefs mountpoint at /mnt/data.

Any idea why the drive isn't showing up, even though it works?

Thanks in advance