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Diffstat (limited to 'sparsify')
| -rw-r--r-- | sparsify/virt-sparsify.pod | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/sparsify/virt-sparsify.pod b/sparsify/virt-sparsify.pod index 14f7eecb..b716350b 100644 --- a/sparsify/virt-sparsify.pod +++ b/sparsify/virt-sparsify.pod @@ -25,6 +25,19 @@ Virt-sparsify can operate on any disk image, not just ones from virtual machines. If a virtual machine has more than one attached disk, you must sparsify each one separately. +=head2 IMPORTANT NOTE ABOUT SPARSE OUTPUT IMAGES + +If the input is raw, then the default output is raw sparse. B<You +must check the output size using a tool that understands sparseness> +such as C<du -sh>. It can make a huge difference: + + $ ls -lh test1.img + -rw-rw-r--. 1 rjones rjones 100M Aug 8 08:08 test1.img + $ du -sh test1.img + 3.6M test1.img + +(Compare the apparent size B<100M> vs the actual size B<3.6M>) + =head2 IMPORTANT LIMITATIONS =over 4 |