Safe lvm reduce

[Demeter Tibor]

Hi !

Thank you  for the fast reply..

Luciano Rocha wrote:
> On Tue, Oct 16, 2007 at 02:34:39PM +0200, Demeter Tibor wrote:
>   
>>  Dear Listmembers !
>>
>>  How can i reduce my LVM logical volume from 1.6 TB to 1.3 TB safely ? I 
>>  using ext3 filesystem on this volume and i never should yet this.
>>  I know my friend is the lvreduce, but how can i reduce the ext3 filesystem 
>>  without datalossing.
>>     
>
> You need to first reduce the filesystem size with the command resize2fs.
>
> Make sure the filesystem is unmounted (use a rescue cd, if necessary,
> but be advised that lvm commads be then prefixed with "lvm "), force
> fsck on it (e2fsck -f device), then run resize2fs new_size_in_fs_blocks.
>
> The value of fs_blocks is usually 4096, but depends on the filesystem.
> You can find the correct value with dumpe2fs device | grep size:
> ...
> Block size:               4096
> ...
>   
If i using resize2fs newsize_in_fs_GB or MBinstead of blocksize then is 
problem?
I don't understand what is the different.

> Afterwards, do the lvm lvresize device -L $((new_size_in_fs_blocks*4))k
>
>   
Regards:

DT