[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for conti

From: Michael R. Hines
Subject: Re: [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints
Date: Tue, 07 Jul 2015 11:56:46 -0500
User-agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

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.


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=,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=,children.1.file.port=6262,children.1.driver=replication,children.1.mode=primary,children.1.ignore-errors=on: Failed to read export length

And server now says:

nbd.c:nbd_handle_export_name():L416: export not found
nbd.c:nbd_send_negotiate():L562: option negotiation failed

reply via email to

[Prev in Thread] Current Thread [Next in Thread]