Re: How do you unsparsify a qcows2 file?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 12/12/22 13:54, ToddAndMargo via users wrote:
On 12/12/22 12:08, ToddAndMargo via users wrote:
On 12/12/22 06:43, Tom Horsley wrote:
On Mon, 12 Dec 2022 06:33:15 -0800
ToddAndMargo via users wrote:

This it?

dd if=/dev/zero of=/sometempfile

Seems like that would work. Might need to do it as root in case the
kernel doesn't allow an ordinary user to use up all the free space on
a disk. And don't forget "rm /sometempfile" once the dd finishes
with out of space errors.

Of course you could take a completely different tack and use
qemu-img convert to change the qcow2 format file to a raw
disk image and modify the virtual machine to use that new file.


I qemu-img to a raw and then back to a qcows2.
Dump/resore still did not restore right.

Now I converted to a raw and am about to see
if dump/restore will restore back correct.

If that does not work, I am going to dd /dev/zero

dump/restore restored a "raw" file perfectly.

Interesting.  sha256sum came back different for
before and after  (.000 is before)

# sha256sum KVM-W11.raw KVM-W11.raw.000

cbc480f889a9e337ab8b41b1e761da5f7f27ad255ceb29d891f60eba8f9903de KVM-W11.raw

6dbf2d0d893f3fc0b5e529a94aad71770bc971ff567881073c8b8a05d9254fca KVM-W11.raw.000

Dump and restore only interact with used blocks. So if there is old data in unused blocks in the original disk, the dump won't save those and the restore won't put them back.
_______________________________________________
users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx
Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx
Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue



[Index of Archives]     [Older Fedora Users]     [Fedora Announce]     [Fedora Package Announce]     [EPEL Announce]     [EPEL Devel]     [Fedora Magazine]     [Fedora Summer Coding]     [Fedora Laptop]     [Fedora Cloud]     [Fedora Advisory Board]     [Fedora Education]     [Fedora Security]     [Fedora Scitech]     [Fedora Robotics]     [Fedora Infrastructure]     [Fedora Websites]     [Anaconda Devel]     [Fedora Devel Java]     [Fedora Desktop]     [Fedora Fonts]     [Fedora Marketing]     [Fedora Management Tools]     [Fedora Mentors]     [Fedora Package Review]     [Fedora R Devel]     [Fedora PHP Devel]     [Kickstart]     [Fedora Music]     [Fedora Packaging]     [Fedora SELinux]     [Fedora Legal]     [Fedora Kernel]     [Fedora OCaml]     [Coolkey]     [Virtualization Tools]     [ET Management Tools]     [Yum Users]     [Yosemite News]     [Gnome Users]     [KDE Users]     [Fedora Art]     [Fedora Docs]     [Fedora Sparc]     [Libvirt Users]     [Fedora ARM]

  Powered by Linux