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1

I want to create virtual 500GB ext4 disks on external usb disks and samba/nfs shares.

For test purposes, I first tried with a 1GB file using the following commands.

sudo dd if=/dev/zero of=/mnt/smbshare/VHD.img bs=1M count=1000

mkfs.ext4 /mnt/smbshare/VHD.img

It works to get a 1GB ext4 filesystem, but dd is slow (10MB/s). So I tried to create a 10GB file with sudo dd if=/dev/zero of=/mnt/smbshare/VHD2.img bs=1G seek=10 count=0. It took few milliseconds, but in this case command mkfs.ext4 /mnt/smbshare/VHD.img returned the following error message:

mke2fs 1.43.3 (04-Sep-2016)

warning: Unable to get device geometry for VHD2.img

VHD2.img: Permission denied while setting up superblock

Is there a fast way to create the file so it can be successfully formatted, for example by changing the dd parameters, adding a further step after dd, or by using an alternate way to create the file?

dd disk mkfs

share|improve this question

edited 25 mins ago

hello world

asked 47 mins ago

hello worldhello world

1633 bronze badges

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• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Unable to get device geometry for VHD2.img is just a warning. Can permission denied be because you created the file with sudo but then invoked mkfs without sudo?
  
  – Kamil Maciorowski
  10 mins ago
  

  
  
  
  

add a comment | 

1

I want to create virtual 500GB ext4 disks on external usb disks and samba/nfs shares.

For test purposes, I first tried with a 1GB file using the following commands.

sudo dd if=/dev/zero of=/mnt/smbshare/VHD.img bs=1M count=1000

mkfs.ext4 /mnt/smbshare/VHD.img

It works to get a 1GB ext4 filesystem, but dd is slow (10MB/s). So I tried to create a 10GB file with sudo dd if=/dev/zero of=/mnt/smbshare/VHD2.img bs=1G seek=10 count=0. It took few milliseconds, but in this case command mkfs.ext4 /mnt/smbshare/VHD.img returned the following error message:

mke2fs 1.43.3 (04-Sep-2016)

warning: Unable to get device geometry for VHD2.img

VHD2.img: Permission denied while setting up superblock

Is there a fast way to create the file so it can be successfully formatted, for example by changing the dd parameters, adding a further step after dd, or by using an alternate way to create the file?

dd disk mkfs

share|improve this question

edited 25 mins ago

hello world

asked 47 mins ago

hello worldhello world

1633 bronze badges

New contributor

hello world is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Unable to get device geometry for VHD2.img is just a warning. Can permission denied be because you created the file with sudo but then invoked mkfs without sudo?
  
  – Kamil Maciorowski
  10 mins ago
  

  
  
  
  

add a comment | 

I want to create virtual 500GB ext4 disks on external usb disks and samba/nfs shares.

For test purposes, I first tried with a 1GB file using the following commands.

sudo dd if=/dev/zero of=/mnt/smbshare/VHD.img bs=1M count=1000

mkfs.ext4 /mnt/smbshare/VHD.img

It works to get a 1GB ext4 filesystem, but dd is slow (10MB/s). So I tried to create a 10GB file with sudo dd if=/dev/zero of=/mnt/smbshare/VHD2.img bs=1G seek=10 count=0. It took few milliseconds, but in this case command mkfs.ext4 /mnt/smbshare/VHD.img returned the following error message:

mke2fs 1.43.3 (04-Sep-2016)

warning: Unable to get device geometry for VHD2.img

VHD2.img: Permission denied while setting up superblock

Is there a fast way to create the file so it can be successfully formatted, for example by changing the dd parameters, adding a further step after dd, or by using an alternate way to create the file?

dd disk mkfs

share|improve this question

edited 25 mins ago

hello world

asked 47 mins ago

hello worldhello world

1633 bronze badges

New contributor

hello world is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

sudo dd if=/dev/zero of=/mnt/smbshare/VHD.img bs=1M count=1000

mkfs.ext4 /mnt/smbshare/VHD.img

share|improve this question

edited 25 mins ago

hello world

asked 47 mins ago

hello worldhello world

1633 bronze badges

New contributor

hello world is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 25 mins ago

hello world

asked 47 mins ago

hello worldhello world

1633 bronze badges

New contributor

hello world is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 47 mins ago

hello worldhello world

1633 bronze badges

New contributor

hello world is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 47 mins ago

hello worldhello world

1633 bronze badges