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Oracle Solaris ZFS Administration Guide     Oracle Solaris 11 Express 11/10
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Document Information

Preface

1.  Oracle Solaris ZFS File System (Introduction)

2.  Getting Started With Oracle Solaris ZFS

3.  Oracle Solaris ZFS and Traditional File System Differences

4.  Managing Oracle Solaris ZFS Storage Pools

5.  Managing ZFS Root Pool Components

6.  Managing Oracle Solaris ZFS File Systems

Managing ZFS File Systems (Overview)

Creating, Destroying, and Renaming ZFS File Systems

Creating a ZFS File System

Destroying a ZFS File System

Renaming a ZFS File System

Introducing ZFS Properties

ZFS Read-Only Native Properties

The used Property

Settable ZFS Native Properties

The canmount Property

The casesensitivity Property

The dedup Property

The encryption Property

The recordsize Property

The sharesmb Property

The volsize Property

ZFS User Properties

Querying ZFS File System Information

Listing Basic ZFS Information

Creating Complex ZFS Queries

Managing ZFS Properties

Setting ZFS Properties

Inheriting ZFS Properties

Querying ZFS Properties

Querying ZFS Properties for Scripting

Mounting and Sharing ZFS File Systems

Managing ZFS Mount Points

Automatic Mount Points

Legacy Mount Points

Mounting ZFS File Systems

Using Temporary Mount Properties

Unmounting ZFS File Systems

Sharing and Unsharing ZFS File Systems

Controlling Share Semantics

Unsharing ZFS File Systems

Sharing ZFS File Systems

Legacy Share Behavior

Sharing ZFS Files in an Oracle Solaris SMB Environment

Setting ZFS Quotas and Reservations

Setting Quotas on ZFS File Systems

Setting User and Group Quotas on a ZFS File System

Setting Reservations on ZFS File Systems

Encrypting ZFS File Systems

Changing an Encrypted ZFS File System's Keys

Delegating ZFS Key Operation Permissions

Mounting an Encrypted ZFS File System

Interactions Between ZFS Compression, Deduplication, and Encryption Properties

Examples of Encrypting ZFS File Systems

Upgrading ZFS File Systems

7.  Working With Oracle Solaris ZFS Snapshots and Clones

8.  Using ACLs and Attributes to Protect Oracle Solaris ZFS Files

9.  Oracle Solaris ZFS Delegated Administration

10.  Oracle Solaris ZFS Advanced Topics

11.  Oracle Solaris ZFS Troubleshooting and Pool Recovery

A.  Oracle Solaris ZFS Version Descriptions

Index

Creating, Destroying, and Renaming ZFS File Systems

ZFS file systems can be created and destroyed by using the zfs create and zfs destroy commands. ZFS file systems can be renamed by using the zfs rename command.

Creating a ZFS File System

ZFS file systems are created by using the zfs create command. The create subcommand takes a single argument: the name of the file system to be created. The file system name is specified as a path name starting from the name of the pool as follows:

pool-name/[filesystem-name/]filesystem-name

The pool name and initial file system names in the path identify the location in the hierarchy where the new file system will be created. The last name in the path identifies the name of the file system to be created. The file system name must satisfy the naming requirements in ZFS Component Naming Requirements.

Encrypting a ZFS file system must be enabled when the file system is created. For information about encrypting a ZFS file system, see Encrypting ZFS File Systems.

In the following example, a file system named bonwick is created in the tank/home file system.

# zfs create tank/home/bonwick

ZFS automatically mounts the newly created file system if it is created successfully. By default, file systems are mounted as /dataset, using the path provided for the file system name in the create subcommand. In this example, the newly created bonwick file system is mounted at /tank/home/bonwick. For more information about automatically managed mount points, see Managing ZFS Mount Points.

For more information about the zfs create command, see zfs(1M).

You can set file system properties when the file system is created.

In the following example, a mount point of /export/zfs is created for the tank/home file system:

# zfs create -o mountpoint=/export/zfs tank/home

For more information about file system properties, see Introducing ZFS Properties.

Destroying a ZFS File System

To destroy a ZFS file system, use the zfs destroy command. The destroyed file system is automatically unmounted and unshared. For more information about automatically managed mounts or automatically managed shares, see Automatic Mount Points.

In the following example, the tabriz file system is destroyed:

# zfs destroy tank/home/tabriz

Caution

Caution - No confirmation prompt appears with the destroy subcommand. Use it with extreme caution.


If the file system to be destroyed is busy and cannot be unmounted, the zfs destroy command fails. To destroy an active file system, use the -f option. Use this option with caution as it can unmount, unshare, and destroy active file systems, causing unexpected application behavior.

# zfs destroy tank/home/ahrens
cannot unmount 'tank/home/ahrens': Device busy

# zfs destroy -f tank/home/ahrens

The zfs destroy command also fails if a file system has descendents. To recursively destroy a file system and all its descendents, use the -r option. Note that a recursive destroy also destroys snapshots, so use this option with caution.

# zfs destroy tank/ws
cannot destroy 'tank/ws': filesystem has children
use '-r' to destroy the following datasets:
tank/ws/billm
tank/ws/bonwick
tank/ws/maybee

# zfs destroy -r tank/ws

If the file system to be destroyed has indirect dependents, even the recursive destroy command fails. To force the destruction of all dependents, including cloned file systems outside the target hierarchy, the -R option must be used. Use extreme caution with this option.

# zfs destroy -r tank/home/schrock
cannot destroy 'tank/home/schrock': filesystem has dependent clones
use '-R' to destroy the following datasets:
tank/clones/schrock-clone

# zfs destroy -R tank/home/schrock

Caution

Caution - No confirmation prompt appears with the -f, -r, or -R options to the zfs destroy command, so use these options carefully.


For more information about snapshots and clones, see Chapter 7, Working With Oracle Solaris ZFS Snapshots and Clones.

Renaming a ZFS File System

File systems can be renamed by using the zfs rename command. With the rename subcommand, you can perform the following operations:

The following example uses the rename subcommand to rename of a file system from kustarz to kustarz_old:

# zfs rename tank/home/kustarz tank/home/kustarz_old

The following example shows how to use zfs rename to relocate a file system:

# zfs rename tank/home/maybee tank/ws/maybee

In this example, the maybee file system is relocated from tank/home to tank/ws. When you relocate a file system through rename, the new location must be within the same pool and it must have enough disk space to hold this new file system. If the new location does not have enough disk space, possibly because it has reached its quota, rename operation fails.

For more information about quotas, see Setting ZFS Quotas and Reservations.

The rename operation attempts an unmount/remount sequence for the file system and any descendent file systems. The rename command fails if the operation is unable to unmount an active file system. If this problem occurs, you must forcibly unmount the file system.

For information about renaming snapshots, see Renaming ZFS Snapshots.