mirror of https://github.com/tLDP/LDP
147 lines
4.0 KiB
XML
147 lines
4.0 KiB
XML
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<appendix id="jfsfsim"><title>JFS file system interface module</title>
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<para>
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The JFS FSIM lets EVMS users create and manage JFS file systems from
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within the EVMS interfaces. In order to use the JFS FSIM, version 1.0.9 or
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later of the JFS utilities must be installed on your system. The latest
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version of JFS can be found at
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<ulink url="http://oss.software.ibm.com/jfs/">http://oss.software.ibm.com/jfs/</ulink>.
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</para>
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<sect1 id="createjfsfsim"><title>Creating JFS file systems</title>
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<para>
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JFS file systems can be created with <command>mkfs</command> on any EVMS
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or compatibility volume (at least 16 MB in size) that does not already
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have a file system. The following options are available for creating
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JFS file systems:</para>
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<variablelist>
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<varlistentry><term>badblocks</term>
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<listitem>
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<para>Perform a read-only check for bad blocks on the volume
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before creating the file system. The default is false.</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>caseinsensitive</term>
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<listitem>
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<para>Mark the file system as case-insensitive (for OS/2 compatibility).
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The default is false.</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>vollabel</term>
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<listitem>
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<para>Specify a volume label for the file system. The default is none.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>journalvol</term>
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<listitem>
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<para>Specify the volume to use for an external journal. This option
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is only available with version 1.0.20 or later of the JFS utilities.
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The default is none.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>logsize</term>
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<listitem>
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<para>
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Specify the inline log size (in MB). This option is only available if
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the journalvol option is not set. The default is 0.4% of the size of
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the volume up to 32 MB.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</sect1>
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<sect1 id="checkjfsfsim"><title>Checking JFS file systems</title>
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<para>
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The following options are available for checking JFS file systems with
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<command>fsck</command>:
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</para>
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<variablelist>
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<varlistentry><term>force</term>
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<listitem>
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<para>Force a complete file system check, even if the file system is
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already marked clean. The default is false.</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>readonly</term>
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<listitem>
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<para>Check the file system is in read-only mode. Report but do not
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fix errors. If the file system is mounted, this option is
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automatically selected. The default is false.</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>omitlog</term>
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<listitem>
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<para>Omit replaying the transaction log. This option should only
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be specified if the log is corrupt. The default is false.</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>verbose</term>
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<listitem>
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<para>Display details and debugging information during the check.
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The default is false.</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>version</term>
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<listitem>
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<para>Display the version of <filename>fsck.jfs</filename> and exit without
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checking the file system. The default is false.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</sect1>
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<sect1 id="removejfsfsim"><title>Removing JFS file systems</title>
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<para>
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A JFS file system can be removed from its volume if the file system is
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unmounted. This operation involves erasing the superblock from the volume
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so the file system will not be recognized in the future. There are no
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options available for removing file systems.
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</para>
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</sect1>
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<sect1 id="expandjfsfsim"><title>Expanding JFS file systems</title>
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<para>
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A JFS file system is automatically expanded when its volume is expanded.
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However, JFS only allows the volume to be expanded if it is mounted,
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because JFS performs all of its expansions online. In addition, JFS only
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allows expansions if version 1.0.21 or later of the JFS utilities are
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installed.
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</para>
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</sect1>
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<sect1 id="shrinkjfsfsim"><title>Shrinking JFS file systems</title>
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<para>
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At this time, JFS does not support shrinking its file systems.
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Hence, volumes with JFS file systems cannot be shrunk.
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</para>
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</sect1>
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</appendix>
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