Verzeichnis in anderes Verzeichnis mounten

since kernel version 2.4 you can mount one directory in another.

mount -rbind /media/storage/vhd /home/vhd

or in the /etc/fstab

/media/storage/vhd  /home/vhd  auto rbind  0 0

man mount:

The bind mounts.
              Since Linux 2.4.0 it is possible to remount part of the file hierarchy somewhere else. The call is
                     mount --bind olddir newdir
              or shortoption
                     mount -B olddir newdir
              or fstab entry is:
                     /olddir /newdir none bind

              After this call the same contents is accessible in two places.  One can also remount a single file (on a single file). It's also possible to use the bind mount to create a mountpoint from a
              regular directory, for example:

                     mount --bind foo foo

              The bind mount call attaches only (part of) a single filesystem, not possible submounts. The entire file hierarchy including submounts is attached a second place using

                     mount --rbind olddir newdir

              or shortoption

                     mount -R olddir newdir

              Note that the filesystem mount options will remain the same as those on the original mount point, and cannot be changed by passing the -o option along with --bind/--rbind. The mount options
              can be changed by a separate remount command, for example:

                     mount --bind olddir newdir
                     mount -o remount,ro newdir

              Note that behavior of the remount operation depends on the /etc/mtab file. The first command stores the 'bind' flag to the /etc/mtab file and the second command  reads  the  flag  from  the
              file.   If  you  have a system without the /etc/mtab file or if you explicitly define source and target for the remount command (then mount(8) does not read /etc/mtab), then you have to use
              bind flag (or option) for the remount command too. For example:

                     mount --bind olddir newdir
                     mount -o remount,ro,bind olddir newdir

mount home dir to other partition:
in fstab after mount of 2nd partiton:
/storage/home /home auto rbind 0 0

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