You might want to think about setting a size on that file. dd can be
pretty destructive as well as useful. I like to randomize file with it
before truncating the contents. For example, if a file is 4096 bytes, I
would use, 'dd if=/dev/zero of=/file bs=4096 count=1 conv=notrunc. Just
so there is no truncation of the file. dd isn't to be played with
haphazardly. Good luck.
B
On 12/12/2022 4:54 PM, 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
>
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