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Re: [Qemu-devel] qemu disk use writeback don't take effect in centos 7.2


From: Dr. David Alan Gilbert
Subject: Re: [Qemu-devel] qemu disk use writeback don't take effect in centos 7.2 1511
Date: Wed, 1 Nov 2017 09:45:38 +0000
User-agent: Mutt/1.9.1 (2017-09-22)

* Paul Schlacter (address@hidden) wrote:
> qemu version:  2.9.0
> image: centos 7.2 1511 raw
> cache mode: writeback
> 
> 
> In centos7.2 time, the use of writeback and none, the result of dd disk is
> the same io, no change
> 
> But I replaced centos7.1 centos7.3 centos7.4 when writeback was
> significantly faster than none
> 
> Would like to ask what is going on, how to solve ?

Hi Paul,
  Can you just clarify your setup please;  do you mean that
with the same qemu setup but a 7.2 guest rather than a 7.1/7.3 guest
the behaviour changes?

Dave

--
Dr. David Alan Gilbert / address@hidden / Manchester, UK



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