--------------------------------------------------
Mr Lyn Rees
Senior Engineer, UIG
Information Services Computing Centre
Cardiff University, 40-41 Park Place,
Cardiff. CF10 3BB.
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Contact numbers:
(029) 2087 9188 (direct)
(029) 2087 4875 (reception)
(029) 2087 4285 (fax)
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Email: rees@cardiff.ac.uk
Web: www.cardiff.ac.uk
| From: | Gabriel <jarod125@gmail.com> |
| To: | linux-lvm@redhat.com |
| Date: | 01/12/2009 00:46 |
| Subject: | show free space _inside_ logical volume |
Hi all,
I'm interested to know if it is possible to check the amount of free
space _inside_ a LV. I know that usually a LV is fully "occupied" by a
partition, but there is a (short) period when there is a gap between
the size of the partition and the size of the LV it resides on. That
happens _after_ doing a lvextend and _before_ doing the resize
(expand) of the filesystem.
First thing I thought of was lvdisplay. While I can see how many LEs
the LV has, I cannot see how many of them are in use by the filesystem
and how many are free (the way pvdisplay shows total/free/allocated
PEs).
It was suggested to me that I try some filesystem tools (resize2fs,
dumpe2fs, tune2fs etc.) that might show me the free space. resize2fs
does not have a 'dry-run' option that would have shown the new size
(in blocks) of the filesystem and I didn't find anything useful in
tune2fs' manual either.
dumpe2fs shows various information such as block count, free blocks
and block size, but I see no modifications when running this before
and after the lvextend command.
I also tried parted -l, but to no avail.
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