[CentOS] LVM

Markus Falb markus.falb at fasel.at
Sun Mar 18 15:08:55 EDT 2012


On 18.3.2012 18:53, John R Pierce wrote:
> On 03/18/12 10:34 AM, madunix at gmail.com wrote:
>> I need to shrink /home(755G) to 150GB and use free space to add to the
>> existing /(50G).
>> #df -kh
>> Filesystem           Size  Used Avail Use% Mounted on
>> /dev/mapper/vg_web-lv_root 50G  7.8G   40G  17% /
>> tmpfs                 7.8G  384K  7.8G   1% /dev/shm
>> /dev/sda2             485M   79M  381M  18% /boot
>> /dev/sda1             200M  256K  200M   1% /boot/efi
>> /dev/mapper/vg_web-lv_home755G  6.2G  711G   1% /home
>>
>> Need to have the step, can this be done online or need to go offline
>> (umount) the file systems.
> 
> IMHO, the only sane way to shrink a file system is to back it up to 
> other media, delete it, then recreate it at the new smaller size and 
> restore the backup.

Thats a safe way to do it. Anyway, regardless of how the goal will be
achieved, I agree that a restorable backup should exist.
-- 
Kind Regards, Markus Falb

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