[CentOS] Re: LVM Resizing Problem

[Scott Silva]

Al Sparks spake the following on 5/2/2007 6:59 PM:
> I'm new to lvm.  I decided to decrease the space of a logical volume.
> So I did a:
>    $ df -m
>    Filesystem           1M-blocks      Used Available Use% Mounted on
>    /dev/mapper/VolGroup00-LogVol00
>                              1953       251      1602  14% /
>    /dev/sda2                  494        21       448   5% /boot
>    tmpfs                     1014         0      1014   0% /dev/shm
>    /dev/mapper/VolGroup00-LogVol05
>                             48481      6685     39295  15% /home
>    /dev/mapper/VolGroup00-LogVol03
>                               961        18       894   2% /tmp
>    /dev/mapper/VolGroup00-LogVol01
>                              7781      2051      5329  28% /usr
>    /dev/mapper/VolGroup00-LogVol02
>                              5239       327      4642   7% /var
> 
> 
> 
>     $ sudo lvm lvreduce -L -1000M /dev/VolGroup00/LogVol05
>     Rounding up size to full physical extent 992.00 MB
>     WARNING: Reducing active and open logical volume to 47.91 GB
>     THIS MAY DESTROY YOUR DATA (filesystem etc.)
>   Do you really want to reduce LogVol05? [y/n]: y
>     Reducing logical volume LogVol05 to 47.91 GB
>     Logical volume LogVol05 successfully resized
LVM even warned you --IN CAPS-- "THIS MAY DESTROY YOUR DATA".
I guess it was right. I haven't had much luck with reducing a volume below its
initial size. I usually make a new LV and rsync or cp -a the data over to it.
 I try to leave some free space just for this. Or add a drive temporarily.

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