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Re: [Xen-users] expanding img file

To: "Paul Eskello" <paul.eskello@xxxxxxxxx>
Subject: Re: [Xen-users] expanding img file
From: "Tom Jensen" <tom.jensen@xxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 13 Apr 2009 13:23:35 -0500
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
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Prior to changing my system over to using filesystems on LVM, I had expanded a DomU disk image file by using the dd option you explained. Expanding the disk image file was done on the Dom0 machine with the DomU shutdown. I then started the DomU and expanded the filesystem on the DomU. It appeared to work okay, but I now find LVM is easier to deal with and has better performance.

Tom Jensen | President
Digital Toolbox

From: "Roy" <onion@xxxxxxxxxx>
Sent: Monday, April 13, 2009 12:51 PM
To: "Paul Eskello" <paul.eskello@xxxxxxxxx>
Cc: <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] expanding img file

This looks backwards.  I would think "mount -o loop /mnt /vm/foo.img"
should be "mount -o loop /vm/foo.img /mnt"

Paul Eskello wrote:

I use xen on centos 5.2 x86 and used virt-install to create a few
virtual machines.

A few days ago centos 5.3 emerged, but I did not allocate enough
diskspace for these virtual machines, only 2 gb. That's way too small
for running yum-upgrade.

So I tried to increase them. With no luck. I found a howto that
instructs me to mount -o loop /mnt /vm/foo.img, but that fails:
"mount: you must specify the filesystem type" .

Specifying ext2 says:
"mount: wrong fs type, bad option, bad superblock on /dev/loop0,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so"

In dmesg:
"loop: loaded (max 8 devices)
hfs: unable to find HFS+ superblock
VFS: Can't find an ext2 filesystem on dev loop0."

Another option I saw was just appending a gigabyte of /dev/zero using
dd. I did that, but the diskspace in the virtual machine stays 2gb.

I think I ran outta options.
Any hints or advice ? Besides building new machines from scratch using
the correct sizes ;-/



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