file system weirdness in lvm

[Chuck Ebbert]

On 07/09/2007 10:15 AM, Justin Conover wrote:
> On 7/7/07, Justin Conover <justin.conover at gmail.com> wrote:
>>
>> 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.
>>
>>
> Interesting, my box at work is the same case.  It seems during install that
> doing an LVM for a seperate /usr and /usr/local breaks......
> 

It's mounting the filesystems in the wrong order, so /usr hides /usr/local.
Whee...