Drive unmounted and now I can't mount it again

[ghost]

I have been using mergerfs for a few days without problems. But today I've shared it with another computer and after a couple hours it has unmounted and didn't let me mount it again.

❯ sudo cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a device; this may
# be used with UUID= as a more robust way to name devices that works even if
# disks are added and removed. See fstab(5).
#
# <file system>             <mount point>  <type>  <options>  <dump>  <pass>
UUID=374A-28F2                            /boot/efi      vfat    umask=0077 0 2
UUID=1aecdb71-bf95-4e25-853c-c709ad46ad6e /              ext4    defaults,noatime 0 1
UUID=71ed32d9-8db4-4067-9ff8-756e4193cd36 swap           swap    defaults,noatime 0 0
tmpfs                                     /tmp           tmpfs   defaults,noatime,mode=1777 0 0
UUID=6e422d20-8963-4b1d-a701-3f9d5a7b6122 /mnt/R ext4 nosuid,nodev,nofail,noauto,x-gvfs-show 0 0
UUID=d605a480-f133-443c-8fe7-5b0a2d1c60c1 /mnt/T ext4 nosuid,nodev,nofail,x-gvfs-show 0 2
UUID=61aea4de-aa02-4f6d-b77d-dc0b09eac2ca /mnt/V ext4 nosuid,nodev,nofail,x-gvfs-show 0 0
UUID=3e3c48c4-9a6f-4a15-b1e1-b6e61b68e6b2 /mnt/W ext4 nosuid,nodev,nofail,x-gvfs-show 0 0
UUID=4e9781ed-4012-4319-a06e-6b0d3070b82e /mnt/X ext4 nosuid,nodev,nofail,x-gvfs-show 0 0
UUID=86b6e5c3-88a3-407b-84ca-71d966e0d0cb /mnt/Y ext4 nosuid,nodev,nofail,x-gvfs-show 0 0
UUID=d08b13d8-8724-49d5-8000-2fdac4176157 /mnt/Z ext4 nosuid,nodev,nofail,x-gvfs-show 0 0
192.168.1.45:/mnt   /srv/nfs/lenovo  nfs auto,bg,intr,soft,x-systemd.automount,x-systemd.device-timeout=10,timeo=5,retrans=5,actimeo=10,retry=5,x-systemd.idle-timeout=1min,x-gvfs-show 0 0
/mnt/T:/mnt/V:/mnt/W:/mnt/X:/mnt/Y:/mnt/Z:/srv/nfs/lenovo/hdd1  /mnt/storage      fuse.mergerfs  allow_other,use_ino,cache.files=off,dropcacheonclose=true,ignorepponrename=true,func.mkdir=epall,x-gvfs-show   0       0

❯ sudo mount -a
fuse: failed to access mountpoint /mnt/storage: Input/output error

Every drive is working:

❯ ls /srv/nfs/lenovo/hdd1 /mnt/*
ls: cannot access '/mnt/storage': Input/output error
/mnt/R:

/mnt/T:
Classify  dl  Documents  fanfic  Images  Literature  lost+found  Personal  Software  Video

/mnt/V:
dl  lost+found  Video

/mnt/W:
lost+found  Video

/mnt/X:
dl  Literature  lost+found  Video

/mnt/Y:
dl  lost+found  Video

/mnt/Z:
dl  lost+found  Video

/srv/nfs/lenovo/hdd1:
Audio  Backups  dl  Games  lost+found  Software

The only thing I've done today is adding an export:

❯ sudo cat /etc/exports
# /etc/exports - exports(5) - directories exported to NFS clients
#
# Example for NFSv3:
#  /srv/home        hostname1(rw,sync) hostname2(ro,sync)
# Example for NFSv4:
#  /srv/nfs4        hostname1(rw,sync,fsid=0)
#  /srv/nfs4/home   hostname1(rw,sync,nohide)
# Using Kerberos and integrity checking:
#  /srv/nfs4        *(rw,sync,sec=krb5i,fsid=0)
#  /srv/nfs4/home   *(rw,sync,sec=krb5i,nohide)
#
# Use `exportfs -arv` to reload.
/mnt/storage  192.168.1.122/24(rw,sync,no_subtree_check,fsid=0)

And using it in another computer with:

❯ ssh [email protected]
❯ sudo cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a device; this may
# be used with UUID= as a more robust way to name devices that works even if
# disks are added and removed. See fstab(5).
#
# <file system>             <mount point>  <type>  <options>  <dump>  <pass>
UUID=5053-CB3F                            /boot/efi      vfat    umask=0077 0 2
UUID=9b3a496c-b2ab-4bf0-ba72-a1c49e0e82ad /              ext4    defaults,noatime 0 1
UUID=6b1020ba-f8d5-48d9-bd19-3b9c984bd1d8 swap           swap    defaults,noatime 0 0
tmpfs                                     /tmp           tmpfs   defaults,noatime,mode=1777 0 0
192.168.1.122:/mnt/storage   /mnt/storage  nfs nosuid,nodev,nofail,x-gvfs-show,x-systemd.automount,x-systemd.device-timeout=10,x-systemd.idle-timeout=1min,bg,intr,soft,timeo=5,retrans=5,actimeo=10,retry=5 0 0

This is really weird

❯ ls -l /mnt
ls: cannot access '/mnt/storage': Input/output error
total 28
drwxr-xr-x  2 user user 4096 ago 29 00:57 R
d?????????  ? ?    ?       ?            ? storage

[trapexit]

It didn't umount. It appears to have crashed for some reason or your system killed it.

Like any crashed fuse or other file system you need to first clean it up.

umount