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Re: [Qemu-block] [PATCH 0/2] use blk_pwrite_zeroes for each zero cluster


From: 858585 jemmy
Subject: Re: [Qemu-block] [PATCH 0/2] use blk_pwrite_zeroes for each zero cluster
Date: Fri, 7 Apr 2017 13:22:31 +0800

the test result for this patch:

the migration command :
virsh migrate --live 165cf436-312f-47e7-90f2-f8aa63f34893
--copy-storage-all qemu+ssh://10.59.163.38/system

the qemu-img info on source host:
qemu-img info 
/instanceimage/165cf436-312f-47e7-90f2-f8aa63f34893/165cf436-312f-47e7-90f2-f8aa63f34893_vda.qcow2
image: 
/instanceimage/165cf436-312f-47e7-90f2-f8aa63f34893/165cf436-312f-47e7-90f2-f8aa63f34893_vda.qcow2
file format: qcow2
virtual size: 1.0T (1095216660480 bytes)
disk size: 1.5G (1638989824 bytes)
cluster_size: 65536
backing file: /baseimage/img2016042213665396/img2016042213665396.qcow2

the qemu-img info on dest host(before apply patch):
qemu-img info 
/instanceimage/165cf436-312f-47e7-90f2-f8aa63f34893/165cf436-312f-47e7-90f2-f8aa63f34893_vda.qcow2
image: 
/instanceimage/165cf436-312f-47e7-90f2-f8aa63f34893/165cf436-312f-47e7-90f2-f8aa63f34893_vda.qcow2
file format: qcow2
virtual size: 40G (42949672960 bytes)
disk size: 4.1G (4423286784 bytes)
cluster_size: 65536
backing file: /baseimage/img2016042213665396/img2016042213665396.qcow2

the qemu-img info on dest host(after apply patch):
qemu-img info 
/instanceimage/165cf436-312f-47e7-90f2-f8aa63f34893/165cf436-312f-47e7-90f2-f8aa63f34893_vda.qcow2
image: 
/instanceimage/165cf436-312f-47e7-90f2-f8aa63f34893/165cf436-312f-47e7-90f2-f8aa63f34893_vda.qcow2
file format: qcow2
virtual size: 40G (42949672960 bytes)
disk size: 2.3G (2496200704 bytes)
cluster_size: 65536
backing file: /baseimage/img2016042213665396/img2016042213665396.qcow2

the disk size reduce from 4.1G to 2.3G.


On Thu, Apr 6, 2017 at 9:15 PM,  <address@hidden> wrote:
> From: Lidong Chen <address@hidden>
>
> BLOCK_SIZE is (1 << 20), qcow2 cluster size is 65536 by default,
> this maybe cause the qcow2 file size is bigger after migration.
> This patch check each cluster, use blk_pwrite_zeroes for each
> zero cluster.
>
> Lidong Chen (2):
>   block: make bdrv_get_cluster_size public
>   migration/block: use blk_pwrite_zeroes for each zero cluster
>
>  block/io.c            |  2 +-
>  include/block/block.h |  1 +
>  migration/block.c     | 34 ++++++++++++++++++++++++++++++++--
>  3 files changed, 34 insertions(+), 3 deletions(-)
>
> --
> 1.8.3.1
>



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