Re: Expanding an LVM

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Dermot Paikkos wrote:
> Hi,
> I think I may have made a error in the method I have used to create 
> more space on one of my servers.
> Here's what I've done.
> 1) Backed up the LVM volume (phew)
> 2) Added some disks to the storage array (HP MSA 20)
> 3) Used the HW Array configurator to do and on-line extend of the  
> Raid Array.
> It was at this point I realised that I hadn't un-mounted the volume 
> in question. 
> The other thing I am trying to figure out is, how I am going to 
> extend a Physical Volume? I think the procedure should have been to 
> add a completely new array and use pvcreate, vgextend, lvextend and  
> extended the filesystem (ext3).
> Can anyone confirm if the procedure above is the correct? 

Correct. You dont expand the PV, you make a new partition with fdisk in
the new space and then create a pv on it, add it to the vg with
vgextend, and the lvextend and then ext2online/resize2fs/whatever to
expand the fs.

> Right now I am considering deleting the RAID container completely and 
> re-creating and restoring rather than waste any more time but before 
> I do I'd like to hear it if sounds like the procedure is bound to 
> fail. 
> At the moment I think the best I can hope for is that the volume will 
> be fine but the extra disk-space will never be seen?

if you dont see the new space in fdisk, you might have to reboot, or do
echo "- - -" > /sys/class/scsi_host/hostXXX/scan.
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