If you want to reproduce it, you can refer to my test case in this bug
description, only differences are:
1) make sure "os.img" is big enough, for example, > 300M
2) write a script to migrate it in a loop:
a) migrate from A to B
b) shutdown guest on B and start it again
c) check if guest os is healthy. (I use guestfs to do this, you can use
ssh to write a simple file in the guest file system)
If error happens, the guest os will be mounted as read-only and a lot of
root file system errors will be thrown out in syslog.
I checked the image size from A to B and noticed that image size is
shrinked dramatically. For example, if source size is 300M, only 10M is
left on host B after migration.
I also print out values of "block_mig_state.submitted",
"block_mig_state.read_done", and "block_mig_state.transferred", and
found that if error happened, "submitted" is zero and "read_done" is not
zero.
For example, if 52 blocks are to be migrated from A to B, when migration is
completed, the three values will be:
submitted = 0, read_done = 40, transferred = 12
That is : a lot of data are actually "readed" but not "transferred",
only part of data are migrated.
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https://bugs.launchpad.net/bugs/1120383
Title:
incremental live block migration of qemu 1.3.1 doesn't work
Status in QEMU:
New
Bug description:
We tested qemu 1.3.1 for live migration of block device. It failed
with error. Since qemu-kvm 1.2.0 is ok for this test, we think this
problem is introduced by new qemu 1.3.x releases.
To reproduce:
1. compile qemu 1.3.1:
# cd qemu-1.3.1
# ./configure --prefix=/usr --sysconfdir=/etc --target-list=x86_64-softmmu
# make; make install
2. prepare source(172.16.1.13):
# qemu-img create -f qcow2 os.img -b /home/reno/wheezyx64 ###Note:
wheezyx64 is a template image for Debian Wheezy
# qemu-system-x86_64 -hda os.img -m 512 --enable-kvm -vnc :51 -monitor
stdio
3. prepare destination(172.16.1.14):
# qemu-img create -f qcow2 os.img -b /home/reno/wheezyx64
# qemu-system-x86_64 -hda os.img -m 512 --enable-kvm -vnc :51 -incoming
tcp:0:4444
4. do live migrate:
on source monitor command prompt, input:
(qemu) migrate -i tcp:172.16.1.14:4444
monitor command will quit immediately and on destination host, there are
errors thrown:
Receiving block device images
Co-routine re-entered recursively
Aborted
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