Latest revision as of 22:59, 14 May 2024

KVM

Clear the empty space

sudo dd if=/dev/zero of=/zerofile bs=1M
sudo rm -f /zerofile

or

sdelete.exe -z C:

Then change the size

qemu-img convert -O qcow2 -c input.qcow2 output.qcow2

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@@ Line 15: / Line 15: @@
 == Expand the size of QCOW2 disk ==
 [http://www.naturalborncoder.com/virtualization/2014/12/05/increasing-the-size-of-a-qcow2-image-under-kvm/ Expand the size of a QCOW2 disk image ]
+== Shrink a QCOW2 disk ==
+Clear the empty space
+ sudo dd if=/dev/zero of=/zerofile bs=1M
+ sudo rm -f /zerofile
+or
+ sdelete.exe -z C:
+Then change the size
+ qemu-img convert -O qcow2 -c input.qcow2 output.qcow2
+=== Copy a Sparse File ===
+From [https://serverfault.com/questions/665335/what-is-fastest-way-to-copy-a-sparse-file-what-method-results-in-the-smallest-f Fastest way to copy a sprse file] the end result was :
+* cp --sparse=always srcFile dstFile
+* dd if=srcFile of=dstFile iflag=direct oflag=direct bs=4M conv=sparse
+* rsync --ignore-existing -aS srcFile dstFile
+* virt-sparsify srcFile dstFile
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