Versions
--------
(Libvirt locally built from a recent git commit -ec7b922):
$ rpm -q libvirt-daemon-kvm qemu-system-x86
libvirt-daemon-kvm-1.2.6-1.fc20.x86_64
qemu-system-x86-2.0.0-1.fc21.x86_64
Test
----
[All images are qcow2 files.]
We have this simple chain:
base <- snap1
Let's quickly examine the contents of 'base' and 'snap1' images:
'base' has just a single file: foo
$ guestfish --ro -a base.qcow2
[. . .]
><fs> ls /
><fs> run
><fs> mount /dev/sda1 /
><fs> ls /
foo
lost+found
><fs> quit
'snap1' has files: bar, baz, jazz
$ guestfish --ro -a snap1.qcow2
[. . .]
><fs> run
><fs> mount /dev/sda1 /
><fs> ls /
bar
baz
jazz
lost+found
><fs>
Now, let's do a live blockcopy (with a '--finish' to graecully finish
the mirroring):
$ virsh blockcopy --domain testvm2 vda \
/export/dst/copy.qcow2 \
--wait --verbose --finish
Examine the contents of the above 'copy':
$ guestfish --ro -a copy.qcow2
[. . .]
><fs> run
><fs> mount /dev/sda1 /
><fs> ls /
bar
baz
jazz
lost+found
><fs> quit
If I'm reading the man page of 'blockcopy' correctly, shouldn't it
'flatten' the entire chain, by also copying the contents of base into
copy.qcow2? i.e. the 'copy' should have files (including the file foo
from 'base':
foo, bar, baz, jazz
True or false?
PS: I've tested the cases of --pivot, --shallow and --reuse-external,
will post my notes about them on a wiki.
--
/kashyap
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