we have rhel server version 7.5

and from lsblk we can see only the following disks , and all disks are with ext4 filesystem

sda                8:0    0 278.9G  0 disk
├─sda1             8:1    0   500M  0 part /boot
└─sda2             8:2    0 278.4G  0 part
  ├─vgN-lv_root 253:0    0    50G  0 lvm  /
  ├─vgN-lv_swap 253:1    0    16G  0 lvm  [SWAP]
  └─vgN-lv_var  253:2    0   100G  0 lvm  /var
sdb                8:16   0   1.7T  0 disk /gr/sdb
sdc                8:32   0   1.7T  0 disk /gr/sdc
sdd                8:48   0   1.7T  0 disk /gr/sdd
sde                8:64   0   1.7T  0 disk /gr/sde

but the interesting thing is that:

when we performed mount -a we get

mount -a
mount: special device /dev/sdf does not exist
mount: special device /dev/sdg does not exist

we not understand from where mount -a gives this disks because they not appears from lsblk and also not from /etc/fstab and not also from /etc/mtab

so why mount -a is complaint about this disks , how we can fix this?

2 Answers 2


Perhaps your /etc/fstab specifies some mounts by either UUID= or LABEL= (causing mount to loop through all block devices it finds) and you have some garbage files as /dev/sdf and /dev/sdg that are not actual device nodes?

Run ls -l /dev/sdf /dev/sdg. If it displays anything, and the letter in the very first column of the permissions string is not b, those are not real block devices. They might have been created by an accidentally mistyped command or two earlier.


(Not an answer, just some suggestions...)

Could it be that on your system the mount command is wrapped in some script?

Could you please post the output of these...

mount --version
type mount
file -L $(which mount)
ls -la $(which -a mount)
cat /etc/fstab
  • mount --version mount from util-linux 2.23.2 (libmount 2.23.0: selinux, debug, assert
    – user436442
    Nov 2, 2020 at 9:39
  • file -L $(which mount) /usr/bin/mount: setuid ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, BuildID[sha1]=8839ecc645f17975765632c4f5c6777e75258d01, stripped
    – user436442
    Nov 2, 2020 at 9:39
  • ls -la $(which -a mount) -rwsr-xr-x. 1 root root 44224 Aug 21 2015 /usr/bin/mount
    – user436442
    Nov 2, 2020 at 9:39
  • What about the last one? cat /etc/fstab
    – Pourko
    Nov 2, 2020 at 10:04

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