[CentOS] is it possible to resive a PV in LVM and add more LV's ?

[Flaherty, Patrick]

Rudi is right, the easiest/fastest thing to do is to just add the new
partition to the pv and expand your lvs as you see fit. But if someone
ever wants to resize a pv I have done it on some vm hosts. It a touch
scary but straight forward (make backups!). It really can only be done
on drives where the lvm is the last partition, or partitions after the
lvm partition is perishable data (swap). 

The steps (from memory lacking arguments)
* fdisk -l /dev/sda (whatever the physical drive is) and write down all
the partition information (make sure you get block alignment if you've
changed that).
* remove the exisiting lvm partiton and whatever partitions are after
it.
* recreate the lvm partition with whatever extra size you want and set
it's type. The os won't recognize the extra space.
* reboot, the os recognises the space
* run pvresize
* run pvscan
* use vgdisplay to find out how many extents available. if you want to
extend a logical volume to the entire pvolume size.
* use resize2fs to extend the filesystem on the volume online.
* use tune2fs to reduce the number of blocks reserved for root to 1%


> -----Original Message-----
> From: centos-bounces at centos.org 
> [mailto:centos-bounces at centos.org] On Behalf Of Rudi Ahlers
> Sent: Monday, May 11, 2009 1:35 AM
> To: CentOS mailing list
> Subject: [CentOS] is it possible to resive a PV in LVM and 
> add more LV's ?
> 
> Hi all
> 
> I have a remote server (i.e SSH access only) which was 
> incorrectly partitioned and I urgently need to get it up and 
> running. It's got a 500GB HDD, but the PV is only 10GB big, 
> so I can't add more LV's to to. P.S. This is on LVM, btw. 
> 
> [root at nd11176 ~]# fdisk -l /dev/sda
> 
> Disk /dev/sda: 500.1 GB, 500107862016 bytes
> 255 heads, 63 sectors/track, 60801 cylinders Units = 
> cylinders of 16065 * 512 = 8225280 bytes
> 
>    Device Boot      Start         End      Blocks   Id  System
> /dev/sda1   *           1          33      265041   83  Linux
> /dev/sda2              34        1338    10482412+  8e  Linux LVM
> /dev/sda3            1339        1860     4192965   82  Linux 
> swap / Solaris
> 
> [root at nd11176 ~]# pvscan
>   PV /dev/sda2   VG VolGroup00   lvm2 [9.97 GB / 0    free]
>   Total: 1 [9.97 GB] / in use: 1 [9.97 GB] / in no VG: 0 [0   ]
> 
> [root at nd11176 ~]# vgscan
>   Reading all physical volumes.  This may take a while...
>   Found volume group "VolGroup00" using metadata type lvm2
> 
> [root at nd11176 ~]# lvscan
>   ACTIVE            '/dev/VolGroup00/LogVol00' [9.97 GB] inherit
> 
> 
> 
> So, my question is, if I extend the Physical Volume, what 
> else do I need todo in order to add more Logical Volume's?
> 
> 
> --
> Kind Regards
> Rudi Ahlers
> CEO, SoftDux Hosting
> Web: http://www.SoftDux.com
> Office: 087 805 9573
> Cell: 082 554 7532
> 
>