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I have following situation:

=$ LC_ALL=C df -hP | column -t
Filesystem              Size  Used  Avail  Use%  Mounted  on
/dev/mapper/vg0-rootlv  19G   854M  17G    5%    /
/dev/mapper/vg0-homelv  19G   343M  18G    2%    /home
/dev/mapper/vg0-optlv   19G   192M  18G    2%    /opt
/dev/mapper/vg0-varlv   19G   357M  18G    2%    /var

I'd like to know what physical disks are used by these volumes, and how much free disk space (unallocated) I have, so that I will know how much I can grow these.

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2 Answers

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This is relatively easy. Use lvdisplay to show logical volumes, vgdisplay to show volume groups (including free space available) and pvdisplay to show physical volumes.

You should get all the data you need from those three commands, albeit with some work to figure out what all the various bits of data mean.

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Thanks. I think I got all the info I wanted. It looks like VGs contain both LVs and PVs, which makes sense. – depesz Apr 22 '11 at 16:45
strictly, vg's contain pv's and lv's are constructed from vg's. Great to hear you got what you needed. – malcolmpdx Apr 22 '11 at 21:47
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The "maps" option is what you are after. This works at the lv level as well as pv.

So if you want to see what room an LV is taking up on a volume, do 

lvdisplay -m <volumegroupname>

If you want to see the usage of PVs, do 

pvdisplay -m
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