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Re: [Qemu-devel] [PATCH COLO v4 00/15] Block replication for continuous
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH COLO v4 00/15] Block replication for continuous checkpoints |
Date: |
Wed, 20 May 2015 20:18:28 +0100 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
* 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-v4
>
> You can get the patch with the other COLO patches here:
> https://github.com/wencongyang/qemu-colo/tree/colo_huawei_v4.7
Hi,
A couple of questions:
1) I still trip the handle_aiocb_rw assertion occasionally;
I see Kevin was asking for some detail on
http://lists.nongnu.org/archive/html/qemu-devel/2015-01/msg04507.html
is that still the right fix?
2) The only stats I see on the block replication are the info block-jobs
completed 'n' of 'm' - is 'n' there just the total number of blocks
written?
Are there any more stats about?
> TODO:
> 1. Test failover when the guest does too many I/O operations. If it
> takes too much time, we need to optimize it.
Limiting the size of the state needed for commit might help that; you can
always trigger a new checkpoint if the size gets too big; it would also
make it more realistic since it will probably fail at the moment if you
fill up the RAM you're using to hold the hidden/active disks with a big
write.
Dave
> 2. Continuous block replication. It will be started after basic functions
> are accepted.
>
> Changs Log:
> 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 (15):
> docs: block replication's description
> allow writing to the backing file
> Allow creating backup jobs when opening BDS
> block: Parse "backing_reference" option to reference existing BDS
> Backup: clear all bitmap when doing block checkpoint
> Don't allow a disk use backing reference target
> Add new block driver interface to connect/disconnect the remote target
> NBD client: implement block driver interfaces to connect/disconnect
> NBD server
> Introduce a new -drive option to control whether to connect to remote
> target
> NBD client: connect to nbd server later
> Add new block driver interfaces to control block replication
> skip nbd_target when starting block replication
> quorum: implement block driver interfaces for block replication
> quorum: allow ignoring child errors
> Implement new driver for block replication
>
> block.c | 270 +++++++++++++++++++++++-
> block/Makefile.objs | 3 +-
> block/backup.c | 13 ++
> block/nbd.c | 67 ++++--
> block/quorum.c | 142 ++++++++++++-
> block/replication.c | 512
> +++++++++++++++++++++++++++++++++++++++++++++
> blockdev.c | 8 +
> blockjob.c | 10 +
> docs/block-replication.txt | 179 ++++++++++++++++
> include/block/block.h | 10 +
> include/block/block_int.h | 18 ++
> include/block/blockjob.h | 12 ++
> qapi/block.json | 16 ++
> qemu-options.hx | 4 +
> tests/qemu-iotests/051 | 13 ++
> tests/qemu-iotests/051.out | 13 ++
> 16 files changed, 1260 insertions(+), 30 deletions(-)
> create mode 100644 block/replication.c
> create mode 100644 docs/block-replication.txt
>
> --
> 2.1.0
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- [Qemu-devel] [PATCH COLO v4 09/15] Introduce a new -drive option to control whether to connect to remote target, (continued)
- [Qemu-devel] [PATCH COLO v4 09/15] Introduce a new -drive option to control whether to connect to remote target, Wen Congyang, 2015/05/08
- [Qemu-devel] [PATCH COLO v4 08/15] NBD client: implement block driver interfaces to connect/disconnect NBD server, Wen Congyang, 2015/05/08
- [Qemu-devel] [PATCH COLO v4 12/15] skip nbd_target when starting block replication, Wen Congyang, 2015/05/08
- [Qemu-devel] [PATCH COLO v4 11/15] Add new block driver interfaces to control block replication, Wen Congyang, 2015/05/08
- [Qemu-devel] [PATCH COLO v4 13/15] quorum: implement block driver interfaces for block replication, Wen Congyang, 2015/05/08
- [Qemu-devel] [PATCH COLO v4 14/15] quorum: allow ignoring child errors, Wen Congyang, 2015/05/08
- [Qemu-devel] [PATCH COLO v4 15/15] Implement new driver for block replication, Wen Congyang, 2015/05/08
- Re: [Qemu-devel] [PATCH COLO v4 00/15] Block replication for continuous checkpoints,
Dr. David Alan Gilbert <=