Re: [Qemu-devel] blockdev-mirror , how to replace old nodename by new nodename ?

[Kashyap Chamarthy <kchamart@redhat.com>]

On Wed, Apr 19, 2017 at 02:28:46PM +0200, Alexandre DERUMIER wrote:
> Thanks I'll try. (I'm on 2.9.0-rc4)
> 
> can you send your initial qemu command line ?

    $ ~/build/qemu-upstream/x86_64-softmmu/qemu-system-x86_64 \
		-display none -nodefconfig -nodefaults -m 512 \
		-device virtio-scsi-pci,id=scsi -device virtio-serial-pci \
		-blockdev node-name=foo,driver=qcow2,file.driver=file,file.filename=./base.qcow2 \
		-monitor stdio -qmp unix:./qmp-sock,server,nowait

> also :
> 
> >>"execute":"blockdev-add", 
> >>"arguments":{ 
> >>"driver":"qcow2", 
> >>"node-name":"node1",

Oops, it should be 'node2'.  Copy / paste mistake, sorry.

> ...
> 
> then 
> 
> 
> >>"execute":"blockdev-mirror", 
> >>"arguments":{ 
> >>"device":"foo", 
> >>"job-id":"job-2", 
> >>"target":"node2",    --> node2 ?  
> >>"sync":"full" 

With the above copy / paste error I noted in the `blockdev-add` command,
the commands I noted in my previous email should work as expected.

Regards,
Kashyap

> ----- Mail original -----
> De: "Kashyap Chamarthy" <kchamart@redhat.com>
> À: "aderumier" <aderumier@odiso.com>
> Cc: "qemu-devel" <qemu-devel@nongnu.org>
> Envoyé: Mercredi 19 Avril 2017 12:43:00
> Objet: Re: [Qemu-devel] blockdev-mirror , how to replace old nodename by new nodename ?
> 
> On Wed, Apr 19, 2017 at 09:08:20AM +0200, Alexandre DERUMIER wrote: 
> > Hi, 
> > 
> > I'm trying to implement blockdev-mirror, to replace drive-mirror as we 
> > can pass more options with blockdev-mirror. 
> > 
> > 
> > I would like to mirror an attached blockdev to a new blockdev, then 
> > switch at the end of block-job-complete, like for drive-mirror. 
> 
> [...] 
> 
> > blockdev-mirror: 
> > 
> > {"arguments":{"job-id":"drive-virtio0","target":"tempmirror","sync":"full","replaces":"drive-virtio0","device":"drive-virtio0"},"execute":"blockdev-mirror"} 
> > 
> > (I have try with or without replaces option) 
> > 
> > then query-name-block-nodes, show vm-138-disk-2.raw file on tempmirror 
> > "node-name", and vm-138-disk1.qcow2 on "drive-virtio0" node-name 
> > 
> > I expected that both was switched, like for drive-mirror. 
> 
> For me, 'blockdev-mirror' does do the switch when I issue 
> 'block-job-complete' (similar to 'drive-mirror') 
> 
> The below is my test from Git: 
> 
> I was here (on Git): 
> 
> $ git describe 
> v2.9.0-rc5 
> 
> ----------------------------------------------------------------------- 
> $ qemu-img create -f qcow2 /export/target2.qcow2 1G 
> Formatting '/export/target2.qcow2', fmt=qcow2 size=1073741824 encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16 
> ----------------------------------------------------------------------- 
> QMP> 
> { 
> "execute":"blockdev-add", 
> "arguments":{ 
> "driver":"qcow2", 
> "node-name":"node1", 
> "file":{ 
> "driver":"file", 
> "filename":"/export/target2.qcow2" 
> } 
> } 
> } 
> {"return": {}} 
> ----------------------------------------------------------------------- 
> QMP> 
> {"execute":"query-named-block-nodes"} 
> [...] 
> ----------------------------------------------------------------------- 
> QMP> 
> { 
> "execute":"blockdev-mirror", 
> "arguments":{ 
> "device":"foo", 
> "job-id":"job-2", 
> "target":"node2", 
> "sync":"full" 
> } 
> } 
> {"return": {}} 
> {"timestamp": {"seconds": 1492598410, "microseconds": 35946}, "event": "BLOCK_JOB_READY", "data": {"device": "job-2", "len": 24182784, "offset": 24182784, "speed": 0, "type": "mirror"}} 
> ----------------------------------------------------------------------- 
> QMP> 
> { 
> "execute":"block-job-complete", 
> "arguments":{ 
> "device":"job-2" 
> } 
> } 
> {"return": {}} 
> {"timestamp": {"seconds": 1492598419, "microseconds": 115458}, "event": "BLOCK_JOB_COMPLETED", "data": {"device": "job-2", "len": 24182784, "offset": 24182784, "speed": 0, "type": "mirror"}} 
> ----------------------------------------------------------------------- 
> 
> 
> [...] 
> 
> 
> -- 
> /kashyap 
>