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To clone a VM which created on sparse image use much more disk space

edited Feb 22, 2010 12:26PM in Oracle VM (OVM) (MOSC) 1 comment
Problem Description:  A clone of a vm machine uses much more disk space. Doing an ls -al shows the file size being the same, however du -h shows it to be almost 12x larger.

Analysis:
Investigated this issue, it caused by the original VM image file is a sparse file(the files size is 147G-"ls -al", the actual used space size is 13G-"du -lh"). I checked the process on Oracle VM server when performing cloning on Oracle VM, details as following:
dd if /var/ovs/mount/3BC75472B0994CFEA8F973B912977D4E/running_pool/32_ttylinux22/Other Linux 2.6.x kernel-0.img iflag direct of /var/ovs/mount/3BC75472B0994CFEA8F973B912977D4E/running_pool/85_test1/Other Linux 2.6.x kernel-0.img bs 1M

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