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>:
> 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
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