[pve-devel] Default cache mode for VM hard drives

[Dietmar Maurer]

> > > Other suggestions how we can handle that?
> > We can create a table "Recommended cache settings for different type
> > of storages" on the "Storage model" wiki page. Should be enough in my
> opinion.
> 
> Thought more about that, and this really looks like a DRBD bug for me. Also,
> other users seems to run well using cache=none.
> 
> What DRBD version do you use?
> 
> Recommending cache=writeback has serious performance impact, so that is
> something you want to avoid.

And people like Florian Haas suggests 'cache=none':

https://fghaas.wordpress.com/category/virtualization/