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* "Too many links" error.
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@ -72,4 +72,44 @@ other.</para>
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</sect1>
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</sect1>
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<sect1><title><quote>Too many links</quote> error in the Nix
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store</title>
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<para>Symptom: when building something, you get an error message such as
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<screen>
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...
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<literal>mkdir: cannot create directory `/nix/store/<replaceable>name</replaceable>': Too many links</literal></screen>
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</para>
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<para>This is usually because you have more than 32,000 subdirectories
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in <filename>/nix/store</filename>, as can be seen using <command>ls
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-l</command>:
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<screen>
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$ ls -l /nix/store
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drwxrwxrwt 32000 nix nix 4620288 Sep 8 15:08 store</screen>
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The <literal>ext2</literal> file system is limited to a inode link
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count of 32,000 (each subdirectory increasing the count by one).
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Furthermore, the <literal>st_nlink</literal> field of the
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<function>stat</function> system call is a 16-bit value.</para>
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<para>This only happens on very large Nix installations (such as build
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machines).</para>
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<para>Quick solution: run the garbage collector.</para>
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<para>Real solution: put the Nix store on a file system that supports
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more than 32,000 subdirectories per directory, such as ReiserFS.
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(This doesn’t solve the <literal>st_nlink</literal> limit, but
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ReiserFS lies to the kernel by reporting a link count of 1 if it
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exceeds the limit.)</para>
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</sect1>
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</appendix>
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</appendix>
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