file system weirdness in lvm

[Justin Conover]

I just noticed something on my desktop running F7.

/usr was at 100%, then I noticed /usr/local was also at 100%, both being
different lvm/fs.  Some how both are the same size and file up at the same
time.....  extend one of them and the other grows....whats up with this?

Example, I'll add some space to /usr


[root at echelon ~]# df -h /usr /usr/local/
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/rootvg-usrlv
                      9.7G  7.4G  1.9G  80% /usr
/dev/mapper/rootvg-locallv
                      9.7G  7.4G  1.9G  80% /usr/local
# ls -l /dev/mapper/
total 0
crw------- 1 root root  10, 63 2007-07-07 04:35 control
brw-rw---- 1 root disk 253,  4 2007-07-07 09:35 rootvg-homelv
brw-rw---- 1 root disk 253,  3 2007-07-07 09:35 rootvg-locallv
brw-rw---- 1 root disk 253,  2 2007-07-07 09:35 rootvg-optlv
brw-rw---- 1 root disk 253,  0 2007-07-07 09:35 rootvg-rootlv
brw-rw---- 1 root disk 253,  7 2007-07-07 04:35 rootvg-swaplv
brw-rw---- 1 root disk 253,  5 2007-07-07 09:35 rootvg-tmplv
brw-rw---- 1 root disk 253,  6 2007-07-07 09:35 rootvg-usrlv
brw-rw---- 1 root disk 253,  1 2007-07-07 09:35 rootvg-varlv

# ls -l /dev/rootvg/
total 0
lrwxrwxrwx 1 root root 25 2007-07-07 04:35 homelv ->
/dev/mapper/rootvg-homelv
lrwxrwxrwx 1 root root 26 2007-07-07 04:35 locallv ->
/dev/mapper/rootvg-locallv
lrwxrwxrwx 1 root root 24 2007-07-07 04:35 optlv -> /dev/mapper/rootvg-optlv
lrwxrwxrwx 1 root root 25 2007-07-07 04:35 rootlv ->
/dev/mapper/rootvg-rootlv
lrwxrwxrwx 1 root root 25 2007-07-07 04:35 swaplv ->
/dev/mapper/rootvg-swaplv
lrwxrwxrwx 1 root root 24 2007-07-07 04:35 tmplv -> /dev/mapper/rootvg-tmplv
lrwxrwxrwx 1 root root 24 2007-07-07 09:38 usrlv -> /dev/mapper/rootvg-usrlv
lrwxrwxrwx 1 root root 24 2007-07-07 04:35 varlv -> /dev/mapper/rootvg-varlv

[root at echelon ~]# lvextend -L+1G /dev/rootvg/usrlv
  Extending logical volume usrlv to 11.00 GB
  Logical volume usrlv successfully resized

[root at echelon ~]# resize2fs /dev/rootvg/usrlv
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/rootvg/usrlv is mounted on /usr; on-line resizing
required
Performing an on-line resize of /dev/rootvg/usrlv to 2883584 (4k) blocks.
The filesystem on /dev/rootvg/usrlv is now 2883584 blocks long.

And the WHAT?  Compare this to the first one at 9.7G

[root at echelon ~]# df -h /usr /usr/local/
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/rootvg-usrlv
                       11G  7.4G  2.8G  73% /usr
/dev/mapper/rootvg-locallv
                       11G  7.4G  2.8G  73% /usr/local

This tells me my box is on crack, outside of that, not sure what is going on
here.
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