Re: [Libguestfs] [Qemu-devel] [qemu-img] support for XVA

On 2017-11-16 11:08, Gandalf Corvotempesta wrote: > 2017-11-15 23:55 GMT+01:00 Max Reitz <mreitz(a)redhat.com&gt;: >> https://xanclic.moe/convert-xva.rb -- does this work? >> (It seems to works on the two example images I found...) >> >> An example is in the code, you use it like this: >> >> $ ./convert-xva.rb ~/Downloads/stats-appliance-2.36.020502.xva Ref:73 > > > It doesn't work on huge images: > > # time convert-xva.rb 20171115_193814_efff_.xva Ref:10 -O qcow2 disk1.qcow2 > /usr/bin/convert-xva.rb:119:in `exec': Argument list too long - > qemu-img (Errno::E2BIG) > from /usr/bin/convert-xva.rb:119:in `<main>' > > real 9m41.414s > user 0m19.280s > sys 0m3.260s Well, there is this: https://github.com/XanClic/qemu.rb/blob/master/examples/convert-xva-onlin... That should get around that restriction, but currently it is stupidly slow (because it just issues all 1 MB copy operations simultaneously), and it doesn't use qemu-img convert. Instead, it uses a real qemu with block jobs. Ideally, you'd use it like this: $ ./convert-xva-online.rb ~/Downloads/stats-appliance-2.36.020502.xva Ref:73 81936 M $ qemu-img create -f qcow2 [whatever options you need] disk1.qcow2 \ 81936M Formatting 'disk1.qcow2', fmt=qcow2 size=85916123136 encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16 $ ./convert-xva-online.rb ~/Downloads/stats-appliance-2.36.020502.xva \ Ref:73 \ '{"driver":"qcow2", "detect-zeroes":"unmap", "discard":"unmap", "file":{"driver":"file","filename":"disk1.qcow2"}}' Adding block devices... Starting block jobs... 100.00 % of jobs completed (Maybe I can get it faster.) Max