-c is for compressed target source image. Naturally, .img file is not compressed.Bugs item #1850911, was opened at 2007-12-14 12:10 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=893831&aid=1850911&group_id=180599 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: qemu Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Olivier Paquet (euzeka) Assigned to: Nobody/Anonymous (nobody) Summary: qemu-img -c not working Initial Comment: With kvm-56, running:qemu-img convert -c winxp64.img -O qcow2 test.imgqemu-img: Alternative compatibility level not supported for this file format
Looking at the source of qemu-img.c, there is an obvious bug at line 474 (if the usage text is to be trusted):
if (flags & BLOCK_FLAG_COMPRESS && drv != &bdrv_vmdk)
error("Alternative compatibility level not supported for this file format");
This should probably be BLOCK_FLAG_COMPAT6.
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