[libvirt-users] (Live) Migration safe vs. unsafe

Michal Privoznik mprivozn at redhat.com
Mon Apr 3 09:15:29 UTC 2017

On 04/03/2017 10:07 AM, Michael Hierweck wrote:
> Hi all,
> virsh checks whether a (live) migration is safe or unsafe. When a
> migration is considered to be unsafe it is rejected unless the --unsafe
> option is prodivided.
> As a part of those checks virsh considers the cache settings for the
> underlying storage resources. In this context only cache="none" is
> considered to be safe.
> I wonder why cache="directsync" might be harmfull as it bypasses the
> host page cache completely.

That's a good question. I too think it isn't harmful. Maybe it's a bug 
in our code?


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