Thanks to recent improvements, qemu flushes guest data to disk when the guest
tells us to do so.
This is great if we care about data consistency on host disk failures. In cases
where we don't it just creates additional overhead for no net win. One such use
case is the building of appliances in SUS
Stefan Hajnoczi wrote:
> On Wed, May 12, 2010 at 10:42 AM, Jamie Lokier wrote:
> > Stefan Hajnoczi wrote:
> >> Why add a nop AIO operation instead of setting
> >> BlockDriverState->enable_write_cache to zero? In that case no write
> >> cache would be reported to the guest (just like cache=writeth
On Wed, May 12, 2010 at 10:42 AM, Jamie Lokier wrote:
> Stefan Hajnoczi wrote:
>> Why add a nop AIO operation instead of setting
>> BlockDriverState->enable_write_cache to zero? In that case no write
>> cache would be reported to the guest (just like cache=writethrough).
>
> Hmm. If the guest se
Stefan Hajnoczi wrote:
> Why add a nop AIO operation instead of setting
> BlockDriverState->enable_write_cache to zero? In that case no write
> cache would be reported to the guest (just like cache=writethrough).
Hmm. If the guest sees write cache absent, that prevents changing the
cache policy
Why add a nop AIO operation instead of setting
BlockDriverState->enable_write_cache to zero? In that case no write
cache would be reported to the guest (just like cache=writethrough).
Stefan
Anthony Liguori wrote:
> There's got to be a better place to fix this. Disable barriers in your
> guests?
If only it were that easy.
OS installs are the thing that this feature would most help. They
take ages, do a huge amount of writing with lots of seeking, and if
the host fails you're going
On 05/10/2010 05:03 PM, Alexander Graf wrote:
On 10.05.2010, at 23:59, Anthony Liguori wrote:
On 05/10/2010 04:51 PM, Alexander Graf wrote:
Thanks to recent improvements, qemu flushes guest data to disk when the guest
tells us to do so.
This is great if we care about data consistenc
On 10.05.2010, at 23:59, Anthony Liguori wrote:
> On 05/10/2010 04:51 PM, Alexander Graf wrote:
>> Thanks to recent improvements, qemu flushes guest data to disk when the guest
>> tells us to do so.
>>
>> This is great if we care about data consistency on host disk failures. In
>> cases
>> wher
On 05/10/2010 04:51 PM, Alexander Graf wrote:
Thanks to recent improvements, qemu flushes guest data to disk when the guest
tells us to do so.
This is great if we care about data consistency on host disk failures. In cases
where we don't it just creates additional overhead for no net win. One su
Thanks to recent improvements, qemu flushes guest data to disk when the guest
tells us to do so.
This is great if we care about data consistency on host disk failures. In cases
where we don't it just creates additional overhead for no net win. One such use
case is the building of appliances in SUS
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