> On Jan 23, 2018, at 8:29 AM, Wietse Venema <wie...@porcupine.org> wrote:
>
> - Your VMM cheats, by disabling SYNCHRONOUS UPDATES of the virtual
> disk. This means you lose mail when the host OS crashes. Postfix
> requires that fsync returns after the data is stored. With caching
> in host memory, fsync returns while the data sits in host memory.
>
> - Your OS in the VM has atime updates disabled, and the physicsal
> host not.
>
> Or a combination of the above.
There could also be performance impacting differences in the syslog
configuration (a bit less likely perhaps, but not impossible).
--
Viktor.
