Re: [Xen-users] increase size for dom guest using lvm online

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Aug 19, 2009 at 04:17:41PM +0100, Simon Hobson wrote:
> I wrote:
> 
> >It may be possible to detatch a volume and re-attach it with xm but 
> >I've never done that.
> 
> Well now I have. Advance planning says I'll need a bit more space on 
> a volume, and there was a little bit of space available on the iSCSI 
> box (so a case of grab it while it's there, before someone else does 
> !).
> 
> Unmounted the volume in the guest, then :
> 
> # cat backup
> <stuff deleted>
> disk    = [ 'phy:vg0/backuproot,xvda1,w', 
> 'phy:vg0/backupvar,xvda2,w', 
> 'phy:/dev/disk/by-path/ip-<very-long-iscsi-address>,xvda3,w', 
> 'phy:vg0/backupswap,xvda4,w' ]
> 
> # xm list
> Name                                        ID   Mem VCPUs      State   
> Time(s)
> Domain-0                                     0   486     4     r-----  
> 67982.4
> backup                                      11   511     2     -b---- 
> 135441.2
> 
> # xm block-detach 11 xvda3
> 
> <do any other steps required, such as altering partitions or resizing 
> LVM volumes>
> 
> # xm block-attach 11 '/dev/disk/by-path/ip-<very-long-iscsi-address>' 
> /dev/xvda3 r
> Error: Device 51715 (vbd) could not be connected. Hotplug scripts not 
> working.
> Usage: xm block-attach <Domain> <BackDev> <FrontDev> <Mode> [BackDomain]
> 
> Create a new virtual block device.
> 
> Checked in teh guest and the device didn't re-appear, so tried again :
> 
> # xm block-attach 11 '/dev/disk/by-path/ip-<very-long-iscsi-address>' 
> /dev/xvda3 r
> Error: Device /dev/xvda3 (51715, vbd) is already connected.
> Usage: xm block-attach <Domain> <BackDev> <FrontDev> <Mode> [BackDomain]
> 
> Create a new virtual block device.
> 
> 
> So I still had to shutdown and re-create the guest for the size 
> change to appear.
>

You need to attach a completely new device, not the same xvda3.

-- Pasi
 
> 
> 
> >In any case, at least with ext3, you need the filesystem unmounted 
> >in order to resize it.
> 
> As "Bart Van Kerckhove" <bart@xxxxxxxx> pointed out, you can do 
> online resize of an ext3 filesystem :
> 
> # df -h /store
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/xvda3             99G   44G   51G  47% /store
> 
> # resize2fs /dev/xvda3
> resize2fs 1.41.3 (12-Oct-2008)
> Filesystem at /dev/xvda3 is mounted on /store; on-line resizing required
> old desc_blocks = 7, new_desc_blocks = 10
> Performing an on-line resize of /dev/xvda3 to 39321087 (4k) blocks.
> The filesystem on /dev/xvda3 is now 39321087 blocks long.
> 
> # df -h /store
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/xvda3            148G   44G   97G  31% /store
> -- 
> Simon Hobson
> 
> Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
> author Gladys Hobson. Novels - poetry - short stories - ideal as
> Christmas stocking fillers. Some available as e-books.
> 
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