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o add faq entry about human readable size rounding

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vortechs 2004-06-07 19:22:42 +00:00
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commit d758c2a543
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LDP/howto/docbook/LVM-HOWTO.xml
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@ -17,6 +17,16 @@
</author>
<revhistory>
<revision>
<revnumber>0.12</revnumber>
<date>2004-06-07</date>
<authorinitials>ajl</authorinitials>
<revremark>
Updated LVM2 FAQ entries
</revremark>
</revision>
<revision>
<revnumber>0.11</revnumber>
<date>2004-05-03</date>
@ -1013,6 +1023,49 @@ swap /dev/vg00/swap 256 Megabytes
</note>
</answer>
</qandaentry>
<qandaentry>
<question>
<para>
I'm trying to fill my vg, and vgdisplay/vgs says that I
have 1.87 GB free, but when I do an lvcreate vg -L1.87G
it says "insufficient free extends". What's going on?
</para>
</question>
<answer>
<para>
The 1.87 GB figure is rounded to 2 decimal places, so
it's probably 1.866 GB or something. This is a
human-readable output to give you a general idea of how
big the VG is. If you want to specify an exact size,
you must use extents instead of some multiple of bytes.
</para>
<para>
In the case of vgdisplay, use the Free PE count instead
of the human readable capacity.
<screen>
Free PE / Size 478 / 1.87 GB
^^^
</screen>
So, this would indicate that you should do run
<screen>
# lvcreate vg -l478 </screen> Note that instead of an upper-case 'L',
we used a lower-case 'l' to tell lvm to use extents
instead of bytes.
</para>
<para>
In the case of vgs, you need to instruct it to tell you how many extents are available:
<screen>
# vgs -o +vg_free_count,vg_extent_count
</screen>
This tell vgs to add the free extents and the total
number of extents to the end of the vgs listing. Use
the free extent number the same way you would in the
above vgdisplay case.
</para>
</answer>
</qandaentry>
</qandaset>
</sect1>