* Wen Congyang (address@hidden) wrote:
Block replication is a very important feature which is used for
continuous checkpoints(for example: COLO).
Usage:
Please refer to docs/block-replication.txt
You can get the patch here:
https://github.com/wencongyang/qemu-colo/commits/block-replication-v7
You can get ths patch with framework here:
https://github.com/wencongyang/qemu-colo/commits/colo_framework_v7.2
Hi,
I seem to be having problems with the new listed syntax on the wiki;
on the secondary I'm getting the error
Block format 'replication' used by device 'virtio0' doesn't support the
option 'export'
./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 \
-device virtio-rng-pci \
-drive
if=none,driver=raw,file=/home/localvms/bugzilla.raw,id=colo1,cache=none,aio=native
\
-drive
if=virtio,driver=replication,mode=secondary,export=colo1,throttling.bps-total-max=70000000,\
file.file.filename=$TMPDISKS/colo-active-disk.qcow2,\
file.driver=qcow2,\
file.backing.file.filename=$TMPDISKS/colo-hidden-disk.qcow2,\
file.backing.driver=qcow2,\
file.backing.backing.backing_reference=colo1,\
file.backing.allow-write-backing-file=on \
-incoming tcp:0:8888
TODO:
1. Continuous block replication. It will be started after basic functions
are accepted.
Changs Log:
V7:
1. Implement adding/removing quorum child. Remove the option non-connect.
2. Simplify the backing refrence option according to Stefan Hajnoczi's
suggestion
V6:
1. Rebase to the newest qemu.
V5:
1. Address the comments from Gong Lei
2. Speed the failover up. The secondary vm can take over very quickly even
if there are too many I/O requests.
V4:
1. Introduce a new driver replication to avoid touch nbd and qcow2.
V3:
1: use error_setg() instead of error_set()
2. Add a new block job API
3. Active disk, hidden disk and nbd target uses the same AioContext
4. Add a testcase to test new hbitmap API
V2:
1. Redesign the secondary qemu(use image-fleecing)
2. Use Error objects to return error message
3. Address the comments from Max Reitz and Eric Blake
Wen Congyang (17):
Add new block driver interface to add/delete a BDS's child
quorum: implement block driver interfaces add/delete a BDS's child
hmp: add monitor command to add/remove a child
introduce a new API qemu_opts_absorb_qdict_by_index()
quorum: allow ignoring child errors
introduce a new API to enable/disable attach device model
introduce a new API to check if blk is attached
block: make bdrv_put_ref_bh_schedule() as a public API
Backup: clear all bitmap when doing block checkpoint
allow writing to the backing file
Allow creating backup jobs when opening BDS
block: Allow references for backing files
docs: block replication's description
Add new block driver interfaces to control block replication
skip nbd_target when starting block replication
quorum: implement block driver interfaces for block replication
Implement new driver for block replication
block.c | 198 +++++++++++++++++-
block/Makefile.objs | 3 +-
block/backup.c | 13 ++
block/block-backend.c | 33 +++
block/quorum.c | 244 ++++++++++++++++++++++-
block/replication.c | 443 +++++++++++++++++++++++++++++++++++++++++
blockdev.c | 90 ++++++---
blockjob.c | 10 +
docs/block-replication.txt | 179 +++++++++++++++++
hmp-commands.hx | 28 +++
include/block/block.h | 11 +
include/block/block_int.h | 19 ++
include/block/blockjob.h | 12 ++
include/qemu/option.h | 2 +
include/sysemu/block-backend.h | 3 +
include/sysemu/blockdev.h | 2 +
qapi/block.json | 16 ++
util/qemu-option.c | 44 ++++
18 files changed, 1303 insertions(+), 47 deletions(-)
create mode 100644 block/replication.c
create mode 100644 docs/block-replication.txt
--
2.4.3
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK