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man pages section 4: File Formats

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Updated: July 2017



vfstab - table of file system defaults


The file /etc/vfstab describes defaults for each file system. The information is stored in a table with the following column headings:

device       device       mount      FS      fsck    mount      mount
to mount     to fsck      point      type    pass    at boot    options

The fields in the table are space-separated and show the resource name (device to mount), the raw device to fsck (device to fsck), the default mount directory (mount point), the name of the file system type (FS type), the number used by fsck to decide whether to check the file system automatically (fsck pass), whether the file system should be mounted automatically by mountall (mount at boot), and the file system mount options (mount options). (See respective mount file system man page below in SEE ALSO for mount options.) A '-' is used to indicate no entry in a field. This can be used when a field does not apply to the resource being mounted.

The getvfsent(3C) family of routines is used to read and write to /etc/vfstab.

/etc/vfstab can be used to specify swap areas. An entry so specified, (which can be a file or a device), automatically is added as a swap area by the /usr/sbin/swapadd script when the system boots. To specify a swap area, the device-to-mount field contains the name of the swap file or device, the FS-type is swap, mount-at-boot is no and all other fields have no entry. The presence in /etc/vfstab of the encrypted option, specified for swap device that is a ZFS volume or a raw device, enables encryption on that device. For a ZFS volume, encryption is enabled by the ZFS encryption property (see zfs(1M)); for a raw device, encryption is enabled by means of lofi(7D).

iSCSI LUN can only be mounted after the iSCSI initiator SMF service, svc:/network/iscsi/initiator, is started. Set the mount at boot entries for iSCSI LUN in /etc/vfstab to iscsi instead of yes. This enables the iSCSI initiator SMF service to attempt to mount iSCSI LUN later.


The following are vfstab entries for various file system types supported in the Solaris operating environment.

Example 1 NFS and UFS Mounts

The following entry invokes NFS to automatically mount the directory /usr/local of the server example1 on the client's /usr/local directory with read-only permission:

example1:/usr/local - /usr/local nfs - yes ro

The following example assumes a small departmental mail setup, in which clients mount /var/mail from a server mailsvr. The following entry would be listed in each client's vfstab:

mailsvr:/var/mail - /var/mail nfs - yes intr,bg

The following is an example for a UFS file system in which logging is enabled:

/dev/dsk/c2t10d0s0 /dev/rdsk/c2t10d0s0 /export/local ufs 3 yes logging

See mount_nfs(1M) for a description of NFS mount options and mount_ufs(1M) for a description of UFS options.

Example 2 pcfs Mounts

The following example mounts a pcfs file system on a fixed hard disk on an x86 machine:

/dev/dsk/c1t2d0p0:c - /win98 pcfs - yes -

The example below mounts a Jaz drive on a SPARC machine. Normally, the volume management software handles mounting of removable media, obviating a vfstab entry. Specifying a device that supports removable media in vfstab with set the mount-at-boot field to no (as shown below) disables the automatic handling of that device. Such an entry presumes you are not running volume management software.

/dev/dsk/c1t2d0s2:c - /jaz pcfs - no -

For removable media on a SPARC machine, the convention for the slice portion of the disk identifier is to specify s2, which stands for the entire medium.

For pcfs file systems on x86 machines, note that the disk identifier uses a p (p0) and a logical drive (c, in the /win98 example above) for a pcfs logical drive. See mount_pcfs(1M) for syntax for pcfs logical drives and for pcfs-specific mount options.

Example 3 Loopback File System Mount

The following is an example of mounting a loopback (lofs) file system:

/export/test - /opt/test lofs - yes -

See lofs(7FS) for an overview of the loopback file system.

See Also

fsck(1M), mount(1M), mount_hsfs(1M), mount_nfs(1M), mount_tmpfs(1M), mount_ufs(1M), swap(1M), zfs(1M), getvfsent(3C), lofi(7D)

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