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<TITLE>Administration Reference</TITLE>
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<A NAME="Top_Of_Page"></A>
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<H1>Administration Reference</H1>
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<HR><P ALIGN="center"> <A HREF="../index.htm"><IMG SRC="../books.gif" BORDER="0" ALT="[Return to Library]"></A> <A HREF="auarf002.htm#ToC"><IMG SRC="../toc.gif" BORDER="0" ALT="[Contents]"></A> <A HREF="auarf035.htm"><IMG SRC="../prev.gif" BORDER="0" ALT="[Previous Topic]"></A> <A HREF="#Bot_Of_Page"><IMG SRC="../bot.gif" BORDER="0" ALT="[Bottom of Topic]"></A> <A HREF="auarf037.htm"><IMG SRC="../next.gif" BORDER="0" ALT="[Next Topic]"></A> <A HREF="auarf284.htm#HDRINDEX"><IMG SRC="../index.gif" BORDER="0" ALT="[Index]"></A> <P>
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<P>
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<H2><A NAME="HDRVN" HREF="auarf002.htm#ToC_34">V<I>n</I></A></H2>
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<P><STRONG>Purpose</STRONG>
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<A NAME="IDX3987"></A>
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<A NAME="IDX3988"></A>
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<A NAME="IDX3989"></A>
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<P>Houses a chunk of AFS data in the disk cache
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<P><STRONG>Description</STRONG>
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<P>A <B>V</B><VAR>n</VAR> file can store a chunk of cached AFS data on a
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client machine that is using a disk cache. As the Cache Manager
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initializes, it verifies that the local disk cache directory houses a number
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of <B>V</B><VAR>n</VAR> files equal to the largest of the following:
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<UL>
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<P><LI>100
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<P><LI>One and a half times the result of dividing the cache size by the chunk
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size (cachesize/chunksize * 1.5)
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<P><LI>The result of dividing the cache size by 10 MB (10,240)
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</UL>
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<P>The Cache Manager determines the cache size from the <B>-blocks</B>
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argument to the <B>afsd</B> command, or if the argument is not included,
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from the third field of the <B>/usr/vice/etc/cacheinfo</B> file.
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The default chunk size is 64 KB; use the <B>-chunksize</B> argument
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to the <B>afsd</B> command to override it. To override the default
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number of chunks resulting from the calculation, include the <B>-files</B>
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argument to the <B>afsd</B> command. The <B>afsd</B> reference
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page describes the restrictions on acceptable values for each of the
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arguments.
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<P>If the disk cache directory houses fewer <B>V</B><VAR>n</VAR> files than
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necessary, the Cache Manager creates new ones, assigning each a unique integer
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<VAR>n</VAR> that distinguishes it from the other files; the integers start
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with 1 and increment by one for each <B>V</B><VAR>n</VAR> file
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created. The Cache Manager removes files if there are more than
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necessary. The Cache Manager also adds and removes
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<B>V</B><VAR>n</VAR> files in response to the <B>fs setcachesize</B>
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command, which can be used to alter the cache size between reboots.
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<P>The standard disk cache directory name is <B>/usr/vice/cache</B>, but
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it is acceptable to use a directory on a partition with more available
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space. To designate a different directory, change the value in the
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second field of the <B>/usr/vice/etc/cacheinfo</B> file before issuing the
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<B>afsd</B> command, or include the <B>-cachedir</B> argument to the
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<B>afsd</B> command.
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<P><B>V</B><VAR>n</VAR> files expand and contract to accommodate the size of
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the AFS directory listing or file they temporarily house. As mentioned,
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by default each <B>V</B><VAR>n</VAR> file holds up to 64 KB (65,536 bytes)
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of a cached AFS element. AFS elements larger than 64 KB are divided
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among multiple <B>V</B><VAR>n</VAR> files. If an element is smaller
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than 64 KB, the <B>V</B><VAR>n</VAR> file expands only to the required
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size. A <B>V</B><VAR>n</VAR> file accommodates only a single element,
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so if there many small cached elements, it is possible to exhaust the
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available <B>V</B><VAR>n</VAR> files without reaching the maximum cache
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size.
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<P><STRONG>Cautions</STRONG>
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<P>Editing or removing a <B>V</B><VAR>n</VAR> file can cause a kernel
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panic. To alter cache size (and thus the number of
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<B>V</B><VAR>n</VAR> files) between reboots, use the <B>fs
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setcachesize</B> command. Alternatively, alter the value of the
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<B>-blocks</B>, <B>-files</B> or <B>-chunksize</B> arguments to
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the <B>afsd</B> command invoked in the machine's AFS initialization
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file, and reboot. To refresh the contents of one or more
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<B>V</B><VAR>n</VAR> files, use the <B>fs flush</B> or <B>fs
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flushvolume</B> command. If a <B>V</B><VAR>n</VAR> file is
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accidentally modified or deleted, rebooting the machine usually restores
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normal performance.
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<P><STRONG>Related Information</STRONG>
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<P><A HREF="auarf043.htm#HDRCACHEINFO">cacheinfo</A>
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<P><A HREF="auarf058.htm#HDRAFSD">afsd</A>
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<P><A HREF="auarf140.htm#HDRFS_FLUSH">fs flush</A>
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<P><A HREF="auarf142.htm#HDRFS_FLUSHVOLUME">fs flushvolume</A>
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<P><A HREF="auarf158.htm#HDRFS_SETCACHESIZE">fs setcachesize</A>
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<P>
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<HR><P ALIGN="center"> <A HREF="../index.htm"><IMG SRC="../books.gif" BORDER="0" ALT="[Return to Library]"></A> <A HREF="auarf002.htm#ToC"><IMG SRC="../toc.gif" BORDER="0" ALT="[Contents]"></A> <A HREF="auarf035.htm"><IMG SRC="../prev.gif" BORDER="0" ALT="[Previous Topic]"></A> <A HREF="#Top_Of_Page"><IMG SRC="../top.gif" BORDER="0" ALT="[Top of Topic]"></A> <A HREF="auarf037.htm"><IMG SRC="../next.gif" BORDER="0" ALT="[Next Topic]"></A> <A HREF="auarf284.htm#HDRINDEX"><IMG SRC="../index.gif" BORDER="0" ALT="[Index]"></A> <P>
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