# Testing Bigger Merge
inaddy@(kvm02):~$ sudo qemu-img info --backing-chain
/var/lib/libvirt/images/guest.1487880011
image: /var/lib/libvirt/images/guest.1487880011
file format: qcow2
virtual size: 30G (32212254720 bytes)
disk size: 196K
cluster_size: 65536
backing file: /var/lib/libvirt/images/guest.1487879972
backing file format: qcow2
Format specific information:
compat: 1.1
lazy refcounts: false
image: /var/lib/libvirt/images/guest.1487879972
file format: qcow2
virtual size: 30G (32212254720 bytes)
disk size: 466M
cluster_size: 65536
backing file: /var/lib/libvirt/images/guest.1487879587
backing file format: qcow2
Format specific information:
compat: 1.1
lazy refcounts: false
image: /var/lib/libvirt/images/guest.1487879587
file format: qcow2
virtual size: 30G (32212254720 bytes)
disk size: 3.6M
cluster_size: 65536
backing file: /var/lib/libvirt/images/guest.1487877813
backing file format: qcow2
Format specific information:
compat: 1.1
lazy refcounts: false
image: /var/lib/libvirt/images/guest.1487877813
file format: qcow2
virtual size: 30G (32212254720 bytes)
disk size: 2.9M
cluster_size: 65536
backing file: /var/lib/libvirt/images/guest.qcow2
backing file format: qcow2
Format specific information:
compat: 1.1
lazy refcounts: false
image: /var/lib/libvirt/images/guest.qcow2
file format: qcow2
virtual size: 30G (32212254720 bytes)
disk size: 5.0G
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
# Writing to guest
inaddy@(guest):~$ dd if=/dev/zero of=./teste bs=1M count=1024
^C465+0 records in
465+0 records out
487587840 bytes (488 MB) copied, 8.74541 s, 55.8 MB/s
# Testing a bigger merge (several snapshots at once)
inaddy@(kvm02):~$ virsh blockcommit --domain=guest
--path=/var/lib/libvirt/images/guest.1487880011 --base
/var/lib/libvirt/images/guest.qcow2 --top
/var/lib/libvirt/images/guest.1487879972 --wait --verbose
Block Commit: [100 %]
Commit complete
# There are only 2 snapshots at the end:
inaddy@(kvm02):~$ sudo qemu-img info --backing-chain
/var/lib/libvirt/images/guest.1487880011
image: /var/lib/libvirt/images/guest.1487880011
file format: qcow2
virtual size: 30G (32212254720 bytes)
disk size: 1.1M
cluster_size: 65536
backing file: /var/lib/libvirt/images/guest.qcow2
backing file format: qcow2
Format specific information:
compat: 1.1
lazy refcounts: false
image: /var/lib/libvirt/images/guest.qcow2
file format: qcow2
virtual size: 30G (32212254720 bytes)
disk size: 5.4G
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
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https://bugs.launchpad.net/bugs/1317491
Title:
virsh blockcommit hangs at 100%
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