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Re: [Qemu-devel] question about live migration with storage
From: |
Zhang Haoyu |
Subject: |
Re: [Qemu-devel] question about live migration with storage |
Date: |
Tue, 10 Mar 2015 10:01:34 +0800 |
On 2015-01-15 18:08:39, Paolo Bonzini wrote:
>
> On 15/01/2015 10:56, Zhang Haoyu wrote:
> > I see, when waiting the completion of drive_mirror IO, the coroutine will be
> > switched back to main-thread to poll and process other events, like qmp
> > request,
> > then after the IO completed, coroutine will be switched back in main-loop
> > process, right?
> >
> > Another question:
> > while starting to migrate storage, will the unused sector be allocated and
> > transferred?
> > regarding the thin-provisioning qcow2 disk, will extra large IO requests be
> > performed, and more data be transferred for the unallocated clusters?
>
> No.
>
My test results show that
when using thin-provisioning qcow2 image(created by qemu-img create -f qcow2
preallocation=metadata),
even the unallocated sectors will be transferred to destination, so much data
is transferred,
so the qcow2 image in destination is full allocated.
Thanks,
Zhang Haoyu
> Paolo
- Re: [Qemu-devel] question about live migration with storage,
Zhang Haoyu <=