Re: [Xen-users] resize xen disk file

[Rudi Ahlers <Rudi@xxxxxxxxxxx>]

Nico Kadel-Garcia wrote:
> Rudi Ahlers wrote:
> > Brian Stempin wrote:
> > > Rudi,
> > >
> > > conv=notrunc prevents dd from truncating the file.  Normally, dd 
> > > would just overwrite the file.  When using conv=notrunc, dd will 
> > > leave the existing data alone and stop taking on 0s when the desired 
> > > file size is reached.
> > Great, so existing data should still stay the same then?
> > > Setting up LVM inside of a VM is the most useful in cases where you 
> > > give the VM direct disk access.  Since you have a file (or a series 
> > > of files), most of the advantages that LVM affords you are redundant.
> > Ok, so you're saying that when I setup the VM's / dum_U's, and I get 
> > to the partitioning part, that I should use LVM? Even thoug h LVM is 
> > already being used on dom0 / the main server's hard drives? That 
> > sounds odd to me, but I'll give it a shot on my next VM deployment
> Use LVM to create partitions, on Dom0, to act like block devices on 
> DomU. Use them as raw block block devices, not LVM, inside the DomU: 
> you can add a pretty arbitrary number of such block devices in DomU, 
> and do your resizing on Dom0 with the DomU shut down. This works well 
> for everything except the boot loader, which is its own adventure in Xen.
> > > Since you're using LVM, you'll have to expand your LVM partitions 
> > > before you can expand the underlying EXT2 file system.  As indicated 
> > > earlier in this email chain, you can expand your LVM group via 
> > > pvresize and lvextend.
> > My main system still has plenty space on the HDD's, and I use image 
> > files for the VM's, not seperate LV's / PV's - The only reason I use 
> > LVM is to make it easier to upgrade the HDD's
> Hmm. Can you keep snapshotting that way? And don't you suffer a 
> performance penalty?
> _______________________________________________
I havent' tired it yet, but it's the theory. Apparently if I add more / 
bigger drives to the system (which runs software RAID), then I should 
just be able to extend the PV's? Like I said, I haven't tried it yet, so 
I don't know if / how it will actually work. But now that you mention 
it, I should probably try it out sometime
--

Kind Regards
Rudi Ahlers
CEO, SoftDux

Web:   http://www.SoftDux.com
Check out my technical blog, http://blog.softdux.com for Linux or other 
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