Determining a File System's Type

You can determine a file system's type by using the following:

• The FS type field in the file system table (/etc/vfstab)

• The /etc/default/fs file for local file systems

• The /etc/dfs/fstypes file for remote file systems

How to Determine the Type of a File System

Use the grep command to find a file system's type in the /etc/vfstab file:

$ grep /tmp /etc/vfstab
swap       -          /tmp     tmpfs   -     yes    -
$

Information for the mount point is displayed.

If vfstab does not have an entry for a file system, use one of the following procedures to determine the file system's type.

How to Determine a Mounted File System's Type

Search the /etc/mnttab for the mount-point directory.

$ grep /home /etc/mnttab
mars:(pid129)  /home nfs  ro,ignore,map=/etc/auto_home,indirect,
dev=21c0004 693606637
neptune:/export/home/neptune  /tmp_mnt/home/neptune  nfsrw,
dev=21c0005 695409833

Information about the mount point is displayed.

Or

1. Use the devnm command to display the raw device name of the mounted file system.

   $ devnm /filesystem

   /filesystem

   Is the mounted file system whose raw device name you want to identify.

2. Become superuser.

3. Use the fstyp command to display the file system type.

   # fstyp dev/rdsk/device-name

   /dev/rdsk/device-name

   Is the name of the raw device containing the file system you want to identify.

Example--Determining a Mounted File System's Type

The following example uses the devnm command to identify the name of the device that contains /usr, a mounted file system. Next, the fstyp command is used to identify what type of file system /usr is.

$ devnm /usr
/dev/dsk/cot3d0s6 /usr
$ su
# fstyp /dev/rdsk/c0t3d0s6
ufs

How to Find Out Which File Systems are Mounted on What Disk Slices

If you know the disk and slice number, you can display information for a disk using the prtvtoc (print volume table of contents) command. You can specify the volume by specifying any non-zero-size slice defined on the disk (for example, /dev/rdsk/c0t3d0s2 for all of disk 3, or /dev/rdsk/c0t3d0s7 for the eighth slice of disk 3). If you know the target number of the disk, but do not know how it is divided into slices, you can show information for the entire disk by specifying either slice 2 or slice 0.

1. Become superuser.

2. Display disk and slice information.

   # prtvtoc /dev/rdsk/devicename

   /dev/rdsk/device-name

   Is the name of the raw device containing the file system you want to identify.

Example--Finding Out Which File Systems are Mounted on What Disk Slices

In this example, information is displayed for all of disk 3:

$ su
Password:
# prtvtoc /dev/rdsk/c0t3d0s2
* /dev/rdsk/c0t3d0s2 (volume "") partition map
*
* Dimensions:
*     512 bytes/sector
*      36 sectors/track
*       9 tracks/cylinder
*     324 sectors/cylinder
*    1272 cylinders
*    1254 accessible cylinders
*
* Flags:
*   1: unmountable
*  10: read-only
*
*                          First     Sector    Last
* Partition  Tag  Flags    Sector    Count     Sector  Mount
Directory
       2      5    01          0    406296    406295
       6      4    00          0    242352    242351
       7      0    00     242352    163944    406295   /files7