[CentOS] is it safe to resize root, on an LVM system, online?

[Digimer]

On 10-07-11 02:27 PM, Rudi Ahlers wrote:
> Hi,
>
> One of our servers has a too small root partition on LVM and needs to
> be resized. Can / be safely increased online, without a reboot?
>
> [root at zaxen02 ~]# lvscan
>    ACTIVE            '/dev/LVM01/root' [4.00 GB] inherit
>    ACTIVE            '/dev/LVM01/home' [20.00 GB] inherit
>    ACTIVE            '/dev/LVM01/var' [4.00 GB] inherit
>    ACTIVE            '/dev/LVM01/swap' [4.00 GB] inherit
>    ACTIVE            '/dev/LVM01/log' [1.00 GB] inherit
>    ACTIVE            '/dev/LVM01/webmin' [2.00 GB] inherit
>    ACTIVE            '/dev/LVM01/xenstored' [2.00 GB] inherit
>    ACTIVE            '/dev/LVM01/xensave' [2.00 GB] inherit
>    ACTIVE            '/dev/LVM01/opennation-net_img' [10.00 GB] inherit
>    ACTIVE            '/dev/LVM01/opennation-net_swap' [1.00 GB] inherit
>    ACTIVE            '/dev/LVM01/pluto_img' [100.00 GB] inherit
>    ACTIVE            '/dev/LVM01/pluto_swap' [1.00 GB] inherit
>    ACTIVE            '/dev/LVM01/tmp' [5.00 GB] inherit
> [root at zaxen02 ~]# pvscan
>    PV /dev/md1   VG LVM01   lvm2 [232.69 GB / 76.69 GB free]
>    Total: 1 [232.69 GB] / in use: 1 [232.69 GB] / in no VG: 0 [0   ]
> [root at zaxen02 ~]#

It depends mainly on the filesystem you are using. The ext[3|4] 
filesystems are fine. You'll have to extend the LV, and then separately 
extend the filesystem itself.

Please test this on a non-production server before trying it on your 
live server, just to be safe and to be sure that you've got your syntax 
right.

-- 
Digimer
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