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Oracle Solaris Administration: ZFS File Systems     Oracle Solaris 11 Information Library
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1.  Oracle Solaris ZFS File System (Introduction)

What's New in ZFS?

ZFS Manual Page Change (zfs.1m)

Improved aclmode Property

Identifying Pool Devices By Physical Location

ZFS Shadow Migration

ZFS File Sharing Improvements

ZFS File System Encryption

ZFS Send Stream Enhancements

ZFS Snapshot Differences (zfs diff)

ZFS Storage Pool Recovery and Performance Enhancements

Tuning ZFS Synchronous Behavior

Improved ZFS Pool Messages

ZFS ACL Interoperability Enhancements

Splitting a Mirrored ZFS Storage Pool (zpool split)

ZFS iSCSI Changes

New ZFS System Process

ZFS Deduplication Property

What Is Oracle Solaris ZFS?

ZFS Pooled Storage

Transactional Semantics

Checksums and Self-Healing Data

Unparalleled Scalability

ZFS Snapshots

Simplified Administration

ZFS Terminology

ZFS Component Naming Requirements

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

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

12.  Archiving Snapshots and Root Pool Recovery

13.  Recommended Oracle Solaris ZFS Practices

A.  Oracle Solaris ZFS Version Descriptions


ZFS Terminology

This section describes the basic terminology used throughout this book:

boot environment

A boot environment is a bootable Oracle Solaris environment consisting of a ZFS root file system and, optionally, other file systems mounted underneath it. Exactly one boot environment can be active at a time.


A 256-bit hash of the data in a file system block. The checksum capability can range from the simple and fast fletcher4 (the default) to cryptographically strong hashes such as SHA256.


A file system whose initial contents are identical to the contents of a snapshot.

For information about clones, see Overview of ZFS Clones.


A generic name for the following ZFS components: clones, file systems, snapshots, and volumes.

Each dataset is identified by a unique name in the ZFS namespace. Datasets are identified using the following format:



Identifies the name of the storage pool that contains the dataset


Is a slash-delimited path name for the dataset component


Is an optional component that identifies a snapshot of a dataset

For more information about datasets, see Chapter 6, Managing Oracle Solaris ZFS File Systems.

file system

A ZFS dataset of type filesystem that is mounted within the standard system namespace and behaves like other file systems.

For more information about file systems, see Chapter 6, Managing Oracle Solaris ZFS File Systems.


A virtual device that stores identical copies of data on two or more disks. If any disk in a mirror fails, any other disk in that mirror can provide the same data.


A logical group of devices describing the layout and physical characteristics of the available storage. Disk space for datasets is allocated from a pool.

For more information about storage pools, see Chapter 4, Managing Oracle Solaris ZFS Storage Pools.


A virtual device that stores data and parity on multiple disks. For more information about RAID-Z, see RAID-Z Storage Pool Configuration.


The process of copying data from one device to another device is known as resilvering. For example, if a mirror device is replaced or taken offline, the data from an up-to-date mirror device is copied to the newly restored mirror device. This process is referred to as mirror resynchronization in traditional volume management products.

For more information about ZFS resilvering, see Viewing Resilvering Status.


A read-only copy of a file system or volume at a given point in time.

For more information about snapshots, see Overview of ZFS Snapshots.

virtual device

A logical device in a pool, which can be a physical device, a file, or a collection of devices.

For more information about virtual devices, see Displaying Storage Pool Virtual Device Information.


A dataset that represents a block device. For example, you can create a ZFS volume as a swap device.

For more information about ZFS volumes, see ZFS Volumes.