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Oracle Solaris Administration: Devices and File Systems     Oracle Solaris 11 Information Library
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Document Information

About This Book

1.  Managing Removable Media (Overview)

2.  Managing Removable Media (Tasks)

3.  Accessing Removable Media (Tasks)

4.  Writing CDs and DVDs (Tasks)

5.  Managing Devices (Overview/Tasks)

6.  Dynamically Configuring Devices (Tasks)

7.  Using USB Devices (Overview)

8.  Using USB Devices (Tasks)

9.  Using InfiniBand Devices (Overview/Tasks)

10.  Managing Disks (Overview)

11.  Administering Disks (Tasks)

12.  SPARC: Setting Up Disks (Tasks)

13.  x86: Setting Up Disks (Tasks)

14.  Configuring Storage Devices With COMSTAR

15.  Configuring and Managing the Oracle Solaris Internet Storage Name Service (iSNS)

16.  The format Utility (Reference)

17.  Managing File Systems (Overview)

18.  Creating and Mounting File Systems (Tasks)

Creating Oracle Solaris File Systems

Creating ZFS File Systems

Creating a Temporary File System

Creating a LOFS File System

Mounting and Unmounting Oracle Solaris File Systems

Field Descriptions for the /etc/vfstab File

Prerequisites for Unmounting Oracle Solaris File Systems

Creating and Mounting Oracle Solaris File Systems

How to Create an ZFS File System

How to Create and Mount a Legacy UFS File System

How to Create and Mount a TMPFS File System

How to Create and Mount an LOFS File System

How to Add an Entry to the /etc/vfstab File

How to Mount a File System (/etc/vfstab File)

How to Mount an NFS File System (mount Command)

x86: How to Mount a PCFS (DOS) File System From a Hard Disk (mount Command)

How to Stop All Processes Accessing a File System

How to Unmount a File System

19.  Configuring Additional Swap Space (Tasks)

20.  Copying Files and File Systems (Tasks)

21.  Managing Tape Drives (Tasks)


Mounting and Unmounting Oracle Solaris File Systems

ZFS file systems are mounted and unmounted automatically. You can make a legacy UFS file system available by mounting it, which attaches the file system to the system directory tree at the specified mount point. The root (/) file system is always mounted.

The following table provides guidelines on mounting file systems based on how you use them.

Mount Type Needed
Suggested Mount Method
Local or remote file systems that need to be mounted infrequently.
The mount command that you type manually from the command line.
Local legacy UFS file systems that need to be mounted frequently. Local ZFS file systems are automatically mounted by an SMF service.
The /etc/vfstab file, which mounts the file system automatically when the system is booted in multi user state.
Remote legacy UFS file systems, such as home directories, that need to be mounted frequently.
  • The /etc/vfstab file, which automatically mounts the file system when the system is booted in multiuser state.
  • autofs, which automatically mounts the file system when you access it or unmounts the file system when you change to another directory.

For more information on mounting removable media, see Chapter 1, Managing Removable Media (Overview).

You can determine which file systems are already mounted by using the mount command.

$ mount [ -v ]

The -v displays the list of mounted file systems in verbose mode.

Example 18-1 Determining Which File Systems Are Mounted

This example shows how to use the mount command to display information about the file systems that are currently mounted.

$ mount
/ on rpool/ROOT/zfsBE read/write/setuid/devices/rstchown/dev=40d0002 on Wed ...
/devices on /devices read/write/setuid/devices/rstchown/dev=9500000 on Wed ...
/dev on /dev read/write/setuid/devices/rstchown/dev=9580000 on Wed Jun ...
/system/contract on ctfs read/write/setuid/devices/rstchown/dev=95c0001 ...
/proc on proc read/write/setuid/devices/rstchown/dev=9540000 on Wed Jun  ...
/etc/mnttab on mnttab read/write/setuid/devices/rstchown/dev=9600001 on Wed ...
/system/volatile on swap read/write/setuid/devices/rstchown/xattr/dev=9640001 ...
/system/object on objfs read/write/setuid/devices/rstchown/dev=9680001 on Wed ...
/etc/dfs/sharetab on sharefs read/write/setuid/devices/rstchown/dev=96c0001 on ...
/dev/fd on fd read/write/setuid/devices/rstchown/dev=97c0001 on Wed Jun  8 ...
/tmp on swap read/write/setuid/devices/rstchown/xattr/dev=9640002 on Wed Jun  ...
/export on rpool/export read/write/setuid/devices/rstchown/nonbmand/exec/xattr/
/export/home on rpool/export/home read/write/setuid/devices/rstchown
/rpool on rpool read/write/setuid/devices/rstchown/nonbmand/exec/
/home/rimmer on pluto:/export/home/rimmer remote/read/write/setuid/xattr/...

This example shows how to use the zfs mount command to display information about ZFS file systems that are currently mounted.

$ zfs mount
rpool/ROOT/solaris              /
rpool/ROOT/solaris/var          /var
rpool                           /rpool
rpool/export                    /rpool/export
rpool/export/home               /rpool/export/home
rpool/export/home/admin         /rpool/export/home/admin

Field Descriptions for the /etc/vfstab File

An entry in the /etc/vfstab file has seven fields, which are described in the following table.

Table 18-1 Field Descriptions for the /etc/vfstab File

Field Name
device to mount
This field identifies one of the following:
  • The block device name for a local legacy UFS file system (for example, /dev/dsk/c8t1d0s7).

  • The resource name for a remote file system (for example, myserver:/export/home). For more information about NFS, see Oracle Solaris Administration: IP Services.

  • The block device name of the slice on which to swap (for example, /dev/dsk/c0t3d0s1).

  • A directory for a virtual file system.

device to fsck
The raw (character) device name that corresponds to the legacy UFS file system identified by the device to mount field (for example, /dev/rdsk/c8t1d0s7). This field determines the raw interface that is used by the fsck command. Use a dash (-) when there is no applicable device, such as for a read-only file system or a remote file system.
mount point
Identifies where to mount the file system (for example, /usr).

FS type
Identifies the type of file system.
fsck pass
The pass number used by the fsck command to decide whether to check a legacy UFS file system. When the field contains a dash (-), the file system is not checked. Currently, the fsck pass value in the /etc/vfstab file is ignored during the boot process.

When the field contains a zero, legacy UFS file systems are not checked. When the field contains a value greater than zero, the UFS file system is always checked.

All legacy UFS file systems with a value of 1 in this field are checked one at a time in the order they appear in the vfstab file. When the fsck command is run on multiple UFS file systems that have fsck pass values greater than 1 and the preen option (-o p) is used, the fsck command automatically checks the file systems on different disks in parallel to maximize efficiency. Otherwise, the value of the pass number does not have any effect.

mount at boot
Set to yes or no for whether the file system should be automatically mounted by the mountall command when the system is booted. Note that this field has nothing to do with autofs. The root (/), /usr and /var file systems are not mounted from the vfstab file initially. This field should always be set to no for these file systems and for virtual file systems such as /proc and /dev/fd.
mount options
A list of comma-separated options (with no spaces) that are used for mounting the file system. Use a dash (-) to indicate no options. For more information, see vfstab(4).

Note - You must have an entry in each field in the /etc/vfstab file. If there is no value for a field, be sure to specify a dash (-). Otherwise, the system might not boot successfully. Similarly, white space should not be used as a field value.

Prerequisites for Unmounting Oracle Solaris File Systems

The prerequisites for unmounting file systems include the following:

To verify that you unmounted a file system or a number of file systems, examine the output from the mount command.

$ mount | grep unmounted-file-system