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Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replicat
From: |
Wen Congyang |
Subject: |
Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints |
Date: |
Wed, 8 Jul 2015 09:38:14 +0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
On 07/08/2015 12:56 AM, Michael R. Hines wrote:
> On 07/07/2015 04:23 AM, Paolo Bonzini wrote:
>>
>> On 07/07/2015 11:13, Dr. David Alan Gilbert wrote:
>>>>> This log is very stange. The NBD client connects to NBD server, and NBD
>>>>> server wants to read data
>>>>> from NBD client, but reading fails. It seems that the connection is
>>>>> closed unexpectedly. Can you
>>>>> give me more log and how do you use it?
>>> That was the same failure I was getting. I think it's that the NBD server
>>> and client are in different
>>> modes, with one of them expecting the export.
>> nbd_server_add always expects the export.
>>
>> Paolo
>>
>
> OK, Wen, so your wiki finally does reflect this, but now we're back to the
> "export not found error".
>
> Again, here's the exact command line:
>
> 1. First on the secondary VM:
>
> qemu-system-x86_64 .........snip........... -drive
> if=none,driver=qcow2,file=foo.qcow2,id=mc1,cache=none,aio=native -drive
> if=virtio,driver=replication,mode=secondary,throttling.bps-total-max=70000000,file.file.filename=active_disk.qcow2,file.driver=qcow2,file.backing.file.filename=hidden_disk.qcow2,file.backing.driver=qcow2,file.backing.allow-write-backing-file=on,file.backing.backing.backing_reference=mc1
>
> 2. Then, then HMP commands:
>
> nbd_server_start 0:6262
> nbd_server_add -w mc1
>
> 3. Then the primary VM:
>
> qemu-system-x86_64 .........snip........... -drive
> if=virtio,driver=quorum,read-pattern=fifo,no-connect=on,children.0.file.filename=bar.qcow2,children.0.driver=qcow2,children.1.file.driver=nbd,children.1.file.host=127.0.0.1,children.1.file.port=6262,children.1.driver=replication,children.1.mode=primary,children.1.ignore-errors=on
>
> With the error: Server requires an export name
>
> *but*, your wiki has no export name on the primary VM size, so I added the
> export name back which is on your old wiki:
>
> qemu-system-x86_64 .........snip........... -drive
> if=virtio,driver=quorum,read-pattern=fifo,no-connect=on,children.0.file.filename=bar.qcow2,children.0.driver=qcow2,children.1.file.driver=nbd,children.1.file.export=mc1,children.1.file.host=127.0.0.1,children.1.file.port=6262,children.1.driver=replication,children.1.mode=primary,children.1.ignore-errors=on:
> Failed to read export length
>
Hmm, I think you use v7 version. Is it right?
In this version, the correct useage for primary qemu is:
1. qemu-system-x86_64 .........snip........... -drive
if=virtio,driver=quorum,read-pattern=fifo,id=disk1,
children.0.file.filename=bar.qcow2,children.0.driver=qcow2,
Then run hmp monitor command(It should be run after you run nbd_server_add in
the secondary qemu):
child_add disk1
child.driver=replication,child.mode=primary,child.file.host=127.0.0.1,child.file.port=6262,child.file.export=mc1,child.file.driver=nbd,child.ignore-errors=on
Thanks
Wen Congyang
> And server now says:
>
> nbd.c:nbd_handle_export_name():L416: export not found
> nbd.c:nbd_send_negotiate():L562: option negotiation failed
>
> .
>
- Re: [Qemu-block] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Dr. David Alan Gilbert, 2015/07/03
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Wen Congyang, 2015/07/04
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Dr. David Alan Gilbert, 2015/07/06
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Michael R. Hines, 2015/07/06
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Wen Congyang, 2015/07/06
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Dr. David Alan Gilbert, 2015/07/07
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Paolo Bonzini, 2015/07/07
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Michael R. Hines, 2015/07/07
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints,
Wen Congyang <=
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Michael R. Hines, 2015/07/08
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Wen Congyang, 2015/07/08
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Dr. David Alan Gilbert, 2015/07/08
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Wen Congyang, 2015/07/08
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Dr. David Alan Gilbert, 2015/07/09
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Wen Congyang, 2015/07/09
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Dr. David Alan Gilbert, 2015/07/09
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Wen Congyang, 2015/07/09
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Dr. David Alan Gilbert, 2015/07/09
- Re: [Qemu-block] [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints, Wen Congyang, 2015/07/09