Need help resizing VM disk

[DavidSz]

Hi,

I know that there are a lot of topics of the same kind, but I can't seem to find the right solution for me..
Same as everyone else I resized the disk but did not thought it would do a +..G

So i'm trying to decrease the Hard Disk


Information:

I'm running a windows server 2012r2 vm, the extra storage hasn't been allocated yet (not sure if it needs to be or not to shrink)


If needed this is the output of pveversion https://pastebin.com/3vZWCUym

What I tried:

qemu-img resize --shrink vm-100-disk-0 300G


I wanted to try lvresize but I'm not sure if its a LVM

Can anyone help me to resize it with 300G without losing data?

Thnx!
David

 

[Moayad]

hi,

Can anyone help me to resize it with 300G without losing data?

Did you tried to resize from GUI?

 

[DavidSz]

hi,




Did you tried to resize from GUI?

No? From GUI you can only go up right? I wanna go down I want to "get rid of" 300G.
May you explain how to do it?

 

[Deleted member 93625]

No? From GUI you can only go up right? I wanna go down I want to "get rid of" 300G.
May you explain how to do it?

View attachment 17844

As far as I know, you cannot shrink disk size. You can only increase. The disk is already recongnised as 1300GB and you are trying to decrease it to 300GB, which will not work.

Eoin

 

[DavidSz]

As far as I know, you cannot shrink disk size. You can only increase. The disk is already recongnised as 1300GB and you are trying to decrease it to 300GB, which will not work.

Eoin

Hi, I'm trying to decrease it to 1000G, I'm not sure how to do it tho, with comment lines or GUI

 

[Deleted member 93625]

Hi, I'm trying to decrease it to 1000G, I'm not sure how to do it tho, with comment lines or GUI

Hi,

I misunderstood, apologies. However, the size doesn't really matter anyway. My point was decreasing the disk size is not possible.

Eoin

 

[Deleted member 93625]

@DavidSz You also have to find the actual disk file's location. The error message says that there's no file with the name you specified. Therefore, the file might be in a different directory.

Eoin

 

[YellowShed]

This is possible but does require messing about on the command line. What you will have to do is dd the old disk into a new disk copying only the first 1000G via a combination of blocksize= and count= arguments to dd. Then, with the VM offline, edit the config file to use the new disk. If it all works, you can delete the old disk.

Another way would be if you had a backup of the VM from before the size increase, You could restore that to give you the original disk size and then resize from there.