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Re: [Qemu-devel] blockdev-mirror , how to replace old nodename by new no
From: |
Alexandre DERUMIER |
Subject: |
Re: [Qemu-devel] blockdev-mirror , how to replace old nodename by new nodename ? |
Date: |
Wed, 19 Apr 2017 11:40:18 +0200 (CEST) |
Ok thanks.
I'll retry without replaces, but I'm pretty sure It was not working too.
Also, I notice something strange,
when I define the job-id (which is mandatory), it's replace the device option.
(If I set a random job-id name, the mirroring is not working because it don't
find the device).
----- Mail original -----
De: "Fam Zheng" <address@hidden>
À: "aderumier" <address@hidden>
Cc: "qemu-devel" <address@hidden>
Envoyé: Mercredi 19 Avril 2017 11:02:36
Objet: Re: [Qemu-devel] blockdev-mirror , how to replace old nodename by new
nodename ?
On Wed, 04/19 09:08, 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.
>
>
> qemu command line (vm-138-disk-1.qcow2 filename on "drive-virtio0" nodename:
>
> -blockdev
> {"node-name":"drive-virtio0","cache":{"direct":true},"driver":"qcow2","file":{"filename":"/var/lib/vz/images/138/vm-138-disk-1.qcow2","aio":"threads","driver":"file"}}
>
> -device
> virtio-blk-pci,drive=drive-virtio0,id=virtio0,bus=pci.0,addr=0xa,write-cache=on
>
>
>
> add a new blockdev with blockdev-add: (a file vm-138-disk-2.raw has been
> created before, I assign it to a "tempmirror" nodename)
>
>
> {"arguments":{"driver":"raw","cache":{"direct":true},"node-name":"tempmirror","file":{"driver":"file","aio":"threads","filename":"/var/lib/vz/images/138/vm-138-disk-2.raw"}},"execute":"blockdev-add"}
>
>
>
> 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.
The replace/switch happens when you do block-job-complete.
And I think in your use case "replaces" is not needed. That one is for
replacing
a node under quorum
Fam