On 07/02/2015 02:42 AM, Dr. David Alan Gilbert wrote: > * Wen Congyang (we...@cn.fujitsu.com) wrote: >> On 07/01/2015 04:11 PM, Dr. David Alan Gilbert wrote: >>> * Wen Congyang (we...@cn.fujitsu.com) wrote: >>>> On 07/01/2015 03:01 AM, Dr. David Alan Gilbert wrote: >>>>> * Wen Congyang (we...@cn.fujitsu.com) wrote: >>>>>> On 06/27/2015 03:03 AM, Dr. David Alan Gilbert wrote: >>>>> >>>>> <snip> >>>>> >>>>>>> Ah, I hadn't realised you could do that; so do you just do: >>>>>>> >>>>>>> migrate_set_parameter colo on >>>>>>> migrate -d -b tcp:otherhhost:port >>>>>>> >>>>>>> How does the secondary know to feed that data straight into the disk >>>>>>> without >>>>>>> recording all the old data into the hidden-disk ? >>>>>> >>>>>> hidden disk and active disk will be made empty when starting block >>>>>> replication. >>>>> >>>>> Hmm, yes - I think I need to update to your current world; in the version >>>>> from the end of May, I get a 'error while loading state for instance 0x0 >>>>> of device 'block'' >>>>> if I try to use migrate -d -b >>>>> (the bdrv_write fails) >>>> >>>> Can you give me both primary and secondary qemu's command? I think the >>>> command line is wrong, >>>> and disk migration fails. >>>> >>> >>> Primary: >>> >>> ./try/bin/qemu-system-x86_64 -enable-kvm -nographic \ >>> -boot c -m 4096 -smp 4 -S \ >>> -name debug-threads=on -trace events=trace-file \ >>> -netdev tap,id=hn0,script=$PWD/ifup-prim,\ >>> downscript=no,colo_script=$PWD/qemu/scripts/colo-proxy-script.sh,colo_nicname=em4 >>> \ >>> -device e1000,mac=9c:da:4d:1c:b5:89,id=net-pci0,netdev=hn0 \ >>> -drive if=virtio,driver=quorum,read-pattern=fifo,no-connect=on,\ >>> cache=none,aio=native,\ >>> children.0.file.filename=./bugzilla.raw,\ >>> children.0.driver=raw,\ >>> children.1.file.driver=nbd,\ >>> children.1.file.host=ibpair,\ >>> children.1.file.port=8889,\ >>> children.1.file.export=colo1,\ >>> children.1.driver=replication,\ >>> children.1.mode=primary,\ >>> children.1.ignore-errors=on >> >> Add id=nbd_target1 to primary disk option, and try it. Disk migration needs >> the same id to sync >> the disk. > > Thank you! That worked nicely. > The only odd thing was that the hidden disk on the secondary went upto ~2GB > in size during > the disk copy; (This is still on the version you posted at the end of may). > I don't really understand why it was 2GB - the disk was 40GB, and qemu-img > tells me that > 2.6GB of it were used. Still, it would be good to avoid the overhead of > going through > the hidden disk on the secondary for the initial replication.
Yes, I have fixed it in v7: starting backup job later. Thanks Wen Congyang > > Dave > >> Thanks >> Wen Congyang >> >>> >>> >>> Secondary: >>> >>> ./try/bin/qemu-system-x86_64 -enable-kvm -nographic \ >>> -boot c -m 4096 -smp 4 -S \ >>> -name debug-threads=on -trace events=trace-file \ >>> -netdev tap,id=hn0,script=$PWD/ifup-slave,\ >>> downscript=no,colo_script=$PWD/qemu/scripts/colo-proxy-script.sh,colo_nicname=em4 >>> \ >>> -device e1000,mac=9c:da:4d:1c:b5:89,id=net-pci0,netdev=hn0 \ >>> -drive >>> if=none,driver=raw,file=bugzilla.raw,id=nbd_target1,cache=none,aio=native \ >>> -drive >>> if=virtio,driver=replication,mode=secondary,export=colo1,throttling.bps-total-max=70000000,\ >>> file.file.filename=/run/colo-active-disk.qcow2,\ >>> file.driver=qcow2,\ >>> file.backing_reference.drive_id=nbd_target1,\ >>> file.backing_reference.hidden-disk.file.filename=/run/colo-hidden-disk.qcow2,\ >>> file.backing_reference.hidden-disk.driver=qcow2,\ >>> file.backing_reference.hidden-disk.allow-write-backing-file=on \ >>> -incoming tcp:0:8888 >>> >>> >>> Thanks, >>> >>> Dave >>> >>>>>>>> If the user uses mirror job, we don't cancel the mirror job now. >>>>>>> >>>>>>> It would be good to get it to work with mirror, that seems preferred >>>>>>> these >>>>>>> days to the old block migration. >>>>>> >>>>>> In normal migration, is mirror job created and cancelled by libvirt? >>>>> >>>>> Yes, I think so; you should be able to turn on full logging on libvirt and >>>>> watch the qmp commands it sends. >>>> >>>> Supporting mirror job in my TODO list now. But I think we should focus the >>>> basci function now. >>>> >>>> Thanks >>>> Wen Congyang >>>> >>>>> >>>>> Dave >>>>> >>>>> -- >>>>> Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK >>>>> . >>>>> >>>> >>> -- >>> Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK >>> . >>> >> > -- > Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK > . >
