qemu-img convert - resulted VM image too big

S

svacaroaia

Member
Oct 4, 2012
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Hi,
I am migratting ( hyper-v) VHD to ( proxmox) raw

Part of the process is to convert the vhd into raw using
qemu-img convert -f vpc -O raw my_disk.vhd my_disk.raw

My problem is that the result of the conversion is always 32Gb regardless of the size of the vhd

Questions:
1. How do I resize / shrink the image ( all my Linux guests are using 5 Gb hard drives ) ?
I tried the following:
boot the Linux guest from systemrescue
use gparted and shrink the partition to 5 Gb
shut off vm
on host, ran qemu-img resize my_disk.img -28G
although all the above commands completed successfully, my image still remain at 32 Gb and , on the guest, fdisk -l /dev/vda1 still shows 32Gb
What am I missing ???

2. Is there a way to convert vhd to img while controlling / specifying the img size ??

3. is there a better /smarter way to migrate Linux guests from Hyper-v to Proxmox than physically copying the vhd, converted then added to newly created proxmox VM ?

Thanks
Steven
 
Mir,
thanks for taking the trouble to provide some guidance
However it is still unclear to me what should I do although I read the redhat document

When you say "resize the filesystem inside the image" aren't you referring to using gparted or something similar on the guest ?
If yes, I already did that ...if no, please elaborate a bit

Thanks
Steven
 
svacaroaia said:
Mir,
thanks for taking the trouble to provide some guidance
However it is still unclear to me what should I do although I read the redhat document

When you say "resize the filesystem inside the image" aren't you referring to using gparted or something similar on the guest ?
If yes, I already did that ...if no, please elaborate a bit

Thanks
Steven
Click to expand...
When I talk about resize filesystem inside the image a mean:
1a) Start the server with the converted image
1b) Start a live distribution like sysrescuecd or gparted live in virtualbox/wmware etc. with the image available <-- the recommended way
2) Use the tools for resize a filesystem which the current filesystem provides (for ext3 and ext4 the tool is resize2fs)

So for ext3 and ext4 using sysrescuecd or gparted live with the image recognized as /dev/sda1 and size 32G reducing to 5G:
1) e2fsck -f /dev/sda1
2) resize2fs -p /dev/sda1 5G
3) e2fsck -f /dev/sda1
4) qemu-img resize my_disk.img -28G

That should do it but as a precaution make a backup before you start.
 
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