I was able to successfully Block Commit using QEMU in Trusty. So the
problem lives likely in libvirt:
#### QEMU (2.0.0+dfsg-2ubuntu1.32)
## HMP CONSOLE
# create a snapshot from "guest.qcow2" to "guestsnap.qcow2"
(qemu) snapshot_blkdev disk0 /var/lib/libvirt/images/guestsnap.qcow2
qcow2
## QMP CONSOLE
# merge the snapshot created back to the base "guest.qcow2"
(qemu) block-commit device=disk0
top=/var/lib/libvirt/images/guestsnap.qcow2
{u'return': {}}
# check block commit statistics
(qemu) query-blockstats (... many times ...)
{u'return': [
{
u'device': u'disk0'
u'backing': {
u'stats': {
u'rd_operations': 3522
u'flush_total_time_ns': 3176656651
u'wr_highest_offset': 30066015744
u'rd_total_time_ns': 458556786
u'rd_bytes': 63168000
u'wr_total_time_ns': 787756681
u'flush_operations': 1251
u'wr_operations': 2787
u'wr_bytes': 16806912
}
u'parent': {
u'stats': {u'rd_operations': 0
u'flush_total_time_ns': 0
u'wr_highest_offset': 2724658688
u'rd_total_time_ns': 0
u'rd_bytes': 0
u'wr_total_time_ns': 0
u'flush_operations': 0
u'wr_operations': 0
u'wr_bytes': 0
}
}
}
u'stats': {
u'rd_operations': 217
u'flush_total_time_ns': 1331436801
u'wr_highest_offset': 30065970688
u'rd_total_time_ns': 127773661
u'rd_bytes': 2453504
u'wr_total_time_ns': 60389213087
u'flush_operations': 376
u'wr_operations': 1015
u'wr_bytes': 57905152
}
u'parent': {
u'stats': {
u'rd_operations': 0
u'flush_total_time_ns': 0
u'wr_highest_offset': 59375104
u'rd_total_time_ns': 0
u'rd_bytes': 0
u'wr_total_time_ns': 0
u'flush_operations': 0
u'wr_operations': 0
u'wr_bytes': 0
}
}
}
]}
# check block-commit job status (100% == offset - len)
(qemu) query-block-jobs
{u'return': [{
u'busy': False,
u'type': u'commit'
u'len': 32212254720
u'paused': False
u'io-status': u'ok'
u'offset': 32212254720
u'device': u'disk0'
u'speed': 0
}]}
## check job was done and pivot was made successfully
(qemu) block-job-complete device=disk0
{u'return': {}}
## check for the block being used for disk0
(qemu) query-block
{'return': [{
'locked': False
'type': 'unknown'
'io-status': 'ok'
'removable': False
'device': 'disk0'
'inserted': {
'bps_rd': 0
'backing_file_depth': 0
'encrypted': False
'image': {
'cluster-size': 65536
'format': 'qcow2'
'filename': '/var/lib/libvirt/images/guest.qcow2'
'virtual-size': 32212254720
'dirty-flag': False
'format-specific': {
'data': {'compat': '1.1'
'lazy-refcounts': False
}
'type': 'qcow2'
}
'actual-size': 5322117120
}
'bps_wr': 0
'drv': 'qcow2'
'bps': 0
'iops': 0
'file': '/var/lib/libvirt/images/guest.qcow2'
'iops_rd': 0
'encryption_key_missing': False
'ro': False
'iops_wr': 0
}
}]}
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https://bugs.launchpad.net/bugs/1317491
Title:
virsh blockcommit hangs at 100%
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https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1317491/+subscriptions
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