Date: Tue, 5 Nov 2013 12:16:29 +0000 (UTC) From: Warren Block <wblock@FreeBSD.org> To: doc-committers@freebsd.org, svn-doc-projects@freebsd.org Subject: svn commit: r43102 - projects/zfsupdate-201307/en_US.ISO8859-1/books/handbook/zfs Message-ID: <201311051216.rA5CGThC055012@svn.freebsd.org>
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Author: wblock Date: Tue Nov 5 12:16:29 2013 New Revision: 43102 URL: http://svnweb.freebsd.org/changeset/doc/43102 Log: Clarify the introduction and trim some redundancy in the "three goals" section. 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 Tue Nov 5 11:27:02 2013 (r43101) +++ projects/zfsupdate-201307/en_US.ISO8859-1/books/handbook/zfs/chapter.xml Tue Nov 5 12:16:29 2013 (r43102) @@ -32,26 +32,30 @@ <title>The Z File System (<acronym>ZFS</acronym>)</title> - <para>The <emphasis>Z File System</emphasis> - (<acronym>ZFS</acronym>) was originally developed at &sun; to - address many of the problems with then-current file systems. - Development has since moved to the <ulink url="http://open-zfs.org">OpenZFS Project</ulink>. For more on - past and future development, see - <xref linkend="zfs-history"/>.</para> + <para>The <emphasis>Z File System</emphasis>, or + <acronym>ZFS</acronym>, is an advanced file system designed to + overcome many of the major problems found in previous + designs.</para> + + <para>Originally developed at &sun;, ongoing <acronym>ZFS</acronym> + development has moved to the + <ulink url="http://open-zfs.org">OpenZFS Project</ulink>. + <xref linkend="zfs-history"/> describes the development history in + more detail.</para> - <para>The three major design goals of <acronym>ZFS</acronym> are:</para> + <para><acronym>ZFS</acronym> has three major design goals:</para> <itemizedlist> <listitem> - <para>Data integrity: All data that is stored on - <acronym>ZFS</acronym> includes a <link + <para>Data integrity: All data + includes a <link linkend="zfs-term-checksum">checksum</link> of the data. When - data is written the checksum is calculated and written along - with the data. When that data is later read back, the - checksum is calculated again and if the values do not match an - error is returned. <acronym>ZFS</acronym> will attempt to - automatically correct the error if there is sufficient - redundancy available.</para> + data is written, the checksum is calculated and written along + with it. When that data is later read back, the + checksum is calculated again. If the checksums do not match, a + data error has been detected. <acronym>ZFS</acronym> will attempt to + automatically correct errors when data + redundancy is available.</para> </listitem> <listitem> @@ -62,13 +66,14 @@ </listitem> <listitem> - <para>Performance: <acronym>ZFS</acronym> features a number of - optional caching mechanisms to provide increased performance. - In addition to an advanced read cache known as the <link - linkend="zfs-term-arc">ARC</link> in memory, there is also the - optional <link linkend="zfs-term-l2arc">L2ARC</link> read - cache and the <link linkend="zfs-term-zil">ZIL</link> - synchronous write cache.</para> + <para>Performance: multiple + caching mechanisms provide increased performance. + <link linkend="zfs-term-arc">ARC</link> is an advanced + memory-based read cache. A second level of + disk-based read cache can be added with + <link linkend="zfs-term-l2arc">L2ARC</link>, and disk-based synchronous + write cache is available with + <link linkend="zfs-term-zil">ZIL</link>.</para> </listitem> </itemizedlist>
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