Date: Thu, 15 Aug 2013 02:39:22 +0000 (UTC) From: Warren Block <wblock@FreeBSD.org> To: doc-committers@freebsd.org, svn-doc-projects@freebsd.org Subject: svn commit: r42549 - projects/zfsupdate-201307/en_US.ISO8859-1/books/handbook/zfs Message-ID: <201308150239.r7F2dMmC091908@svn.freebsd.org>
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Author: wblock Date: Thu Aug 15 02:39:21 2013 New Revision: 42549 URL: http://svnweb.freebsd.org/changeset/doc/42549 Log: Rewrite the introductory paragraph, fix miscellaneous errors. Modified: projects/zfsupdate-201307/en_US.ISO8859-1/books/handbook/zfs/chapter.xml Modified: projects/zfsupdate-201307/en_US.ISO8859-1/books/handbook/zfs/chapter.xml ============================================================================== --- projects/zfsupdate-201307/en_US.ISO8859-1/books/handbook/zfs/chapter.xml Thu Aug 15 02:28:43 2013 (r42548) +++ projects/zfsupdate-201307/en_US.ISO8859-1/books/handbook/zfs/chapter.xml Thu Aug 15 02:39:21 2013 (r42549) @@ -17,21 +17,33 @@ <title>The Z File System (<acronym>ZFS</acronym>)</title> - <para>The Z file system, originally developed by &sun;, - is designed to future proof the file system by removing many of - the arbitrary limits imposed on previous file systems. ZFS - allows continuous growth of the pooled storage by adding - additional devices. ZFS allows you to create many file systems - (in addition to block devices) out of a single shared pool of - storage. Space is allocated as needed, so all remaining free - space is available to each file system in the pool. It is also - designed for maximum data integrity, supporting data snapshots, - multiple copies, and cryptographic checksums. It uses a - software data replication model, known as - <acronym>RAID</acronym>-Z. <acronym>RAID</acronym>-Z provides - redundancy similar to hardware <acronym>RAID</acronym>, but is - designed to prevent data write corruption and to overcome some - of the limitations of hardware <acronym>RAID</acronym>.</para> + <para>The <emphasis>Z File System</emphasis> + (<acronym>ZFS</acronym>) was developed at &sun; to address many of + the problems with current file systems. There were three major + design goals:</para> + + <itemizedlist> + <listitem> + <para>Data integrity: checksums are created when data is written + and checked when data is read. If on-disk data corruption is + detected, the user is notified and recovery methods are + initiated.</para> + </listitem> + + <listitem> + <para>Pooled storage: physical storage devices are added to a + pool, and storage space is allocated from that shared pool. + Space is available to all file systems, and can be increased + by adding new storage devices to the pool.</para> + </listitem> + + <listitem> + <para>Performance:</para> + </listitem> + </itemizedlist> + + <para>A complete list of <acronym>ZFS</acronym> features and + terminology is shown in <xref linkend="zfs-term"/>.</para> <sect1 id="zfs-differences"> <title>What Makes <acronym>ZFS</acronym> Different</title> @@ -1168,7 +1180,7 @@ vfs.zfs.vdev.cache.size="5M"</programlis <entry id="zfs-term-snapshot">Snapshot</entry> <entry>The <link - linkend="zfs-term-cow">copy-on-write</link> design of + linkend="zfs-term-cow">copy-on-write</link> (<acronym>COW</acronym>) design of <acronym>ZFS</acronym> allows for nearly instantaneous consistent snapshots with arbitrary names. After taking a snapshot of a dataset (or a recursive snapshot of a @@ -1259,7 +1271,7 @@ vfs.zfs.vdev.cache.size="5M"</programlis The fletcher algorithms are faster, but sha256 is a strong cryptographic hash and has a much lower chance of - a collisions at the cost of some performance. Checksums + collisions at the cost of some performance. Checksums can be disabled but it is inadvisable.</entry> </row> @@ -1278,7 +1290,7 @@ vfs.zfs.vdev.cache.size="5M"</programlis <note> <para><acronym>LZ4</acronym> compression is only - available after &os; 9.2</para> + available after &os; 9.2.</para> </note></entry> </row>help
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