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[Qemu-discuss] using a Disk-image in qemu

From: Philipp Walderdorff
Subject: [Qemu-discuss] using a Disk-image in qemu
Date: Wed, 9 Dec 2015 11:58:40 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0

I wanted to transfer the image of a disc from an old slowly PC (Fedora (2.6.21-1.3194.fc7) to a modern ubuntu 15.04 -PC.
Therfore I did the following:

dd if=/dev/sda1 | gzip -9 - | ssh address@hidden "cat > /Datenplatte/Fc7Platte.img.gz"

and on I did:
gunzip /Datenplatte/Fc7Platte.img.gz

Then in the gnome-terminal:

qemu-system-i386 /Datenplatte/Fc7Platte.img

This could boot Fedora (2.6.21-1.3194.fc7)
root /hd0,0)
filesystem type is ext2fs, partition type 0x83
kernel /vmlinuz-2.6.21-1.3194.fc7 ro root_LABEL=/   rhgb quiet
initrd /initrd-2.6.21-1.3194.fc7.img

uncompressing Linux ... Ok, booting the kernel.
PCI: PIIX3: Enabeling Passive Release on 0000:00:01.0
Red Hat nash version 6.0.9 starting
Unable to acess resume devuice (LABEL=SWAP-sda3)
mount: could not find filesystem '/dev/root'
setuproot: moving /dev failed: No such file or directory
setuproot: error mounting /proc: No such file ore directory
setuproot: error mounting /sys: No such file or directory
switchroot: mount failed: No such file or directory
Kernel panic - no syncing: Attempted to kill init!

I suppose, there is a problem with recognizing the partitions.
In the old Fedora-PC fdisk shows the same datas concerning the structure of the disc like on the modern Ubuntu-15.04-PC

/Datenplatte$ fdisk -lu /Datenplatte/Fc7Platte.img

Disk /Datenplatte/Fc7Platte.img: 15,8 GiB, 16907304960 bytes, 33022080 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xaffeaffe

Device                      Boot   Start      End  Sectors   Size Id Type
/Datenplatte/Fc7Platte.img1 *         63   401624   401562 196,1M 83 Linux
/Datenplatte/Fc7Platte.img2       401625  8594774  8193150   3,9G 83 Linux
/Datenplatte/Fc7Platte.img3 8594775 9622934 1028160 502M 82 Linux swap /Datenplatte/Fc7Platte.img4 9622935 33013574 23390640 11,2G 5 Extended
/Datenplatte/Fc7Platte.img5      9622998 33013574 23390577  11,2G 83 Linux

Only difference: The Device-names in the image-file /Datenplatte/Fc7Platte.img have changed from /dev/sda1 to /Datenplatte/Fc7Platte.img1
and so on.

Is that the problem? Is the problem, that grub is expecting root on /dev/sda2 but there is only /Datenplatte/Fc7Platte.img2 ???

Does someone have an idia?
thank you verry much

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