Re: [Qemu-discuss] Understanding QEMU Cache Modes and Emulated Disk Write Cache

[Dominique Ramaekers]

Hi there,

This is a very interesting discussion in which I was reminded on the different 
cache modes. 

I have a supplementary question dough.

Sometimes if I change the cache mode of a guest system disk, the guest won't 
work
properly (it hangs, crashes,...). Never yet with a nix system but It happens 
with Windows
guests.

Does anyone has experience with changing the cache mode on disks in Windows 
guest?

Greetings,

Dominique.

> -----Oorspronkelijk bericht-----
> Van: Qemu-discuss [mailto:qemu-discuss-
> address@hidden Namens Fam Zheng
> Verzonden: woensdag 17 augustus 2016 13:43
> Aan: wyang
> CC: address@hidden
> Onderwerp: Re: [Qemu-discuss] Understanding QEMU Cache Modes and
> Emulated Disk Write Cache
> 
> On Wed, 08/17 17:26, wyang wrote:
> > On 2016年08月17日 15:50, Fam Zheng wrote:
> > >
> > >I am confused about the difference between the guest disk write cache

...

> have to report WCE=1 to guest, so it knows FLUSH is needed.
> 
> Fam
> 
> >
> > http://www.ibm.com/support/knowledgecenter/linuxonibm/liaat/liaatbpkvm
> > guestcache.htm
> >
> > Thanks
> > Wei