Hi There,
There is a case I met about the destination file's disk size after do
blockcopy
Details as below:
Env:
# rpm -q libvirt qemu-kvm-rhev
libvirt-1.1.1-29.el7.x86_64
qemu-kvm-rhev-1.5.3-60.el7ev_0.2.x86_64
1. Check source file
# qemu-img info /var/lib/libvirt/images/rhel6.img
image: /var/lib/libvirt/images/rhel6.img
file format: qcow2
virtual size: 5.0G (5368709120 bytes)
disk size: 1.2G
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
# ll -lash /var/lib/libvirt/images/rhel6.img
1.2G -rw-r--r--. 1 qemu qemu 1.2G Jul 22 11:04
/var/lib/libvirt/images/rhel6.img
Here: Disk Size is "1.2G"
2. Do blockcopy
# virsh domblklist rhel6
Target Source
------------------------------------------------
vda /var/lib/libvirt/images/rhel6.img
# time virsh blockcopy rhel6 vda /var/lib/libvirt/images/copy.img --wait
--verbose
Block Copy: [100 %]
Now in mirroring phase
real 0m21.285s
user 0m0.038s
sys 0m0.018s
3. Check destination file's disk size
# qemu-img info /var/lib/libvirt/images/copy.img
image: /var/lib/libvirt/images/copy.img
file format: qcow2
virtual size: 5.0G (5368709120 bytes)
disk size: 2.0G
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
# ll -lash /var/lib/libvirt/images/copy.img
2.1G -rw-------. 1 qemu qemu 1.2G Jul 22 11:10
/var/lib/libvirt/images/copy.img
Here: Disk Size is "2.0G"
So my question is why the "disk size" is different between source file
and destination file ? (Actually, the destination always change after I
try many times, sometime it is same size as source, sometimes it is
lager than source.)
4. Do --pivot
After --pivot, the disk size is same size as after blockcopy
--
Regards
shyu
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