Enabling s3fs on samba4 DC

[Daniele Dario]

Hi samba team,
it's a long time since my last question and I've seen many progresses
during this time so I'll say you "great job guys".

In my installation I have 2 s4 DCs (at the moment DC1 is Version
4.0.0beta3-GIT-d1aeb2d and DC2 is Version 4.0.0beta3-GIT-c983ea8) both
are using bind 9.9 + samba_dlz for DNS and they are running without
problems since my last update to beta3 (again great job guys).

I'm planning to move network shares from a s3 fileserver which is joined
to the domain to DC2 and I'd use s3fs (to reduce HW) but I've heard that
there are some things to do when changing from NTVFS to s3fs (both DCs
are using NTVFS) so can someone please point me to the right way to
proceed?

Is it better to upgrade to latest beta release before to migrate from
NTVFS to S3FS?

When upgrading to latest release I would run samba-tool dbcheck
--cross-ncs --fix on the installation I've upgraded before to start
samba am I right?
This should check and fix dbs in the DC I've upgraded so shall I check
something before to restart samba to avoid replication problems with the
other DC?
I would start upgrading the "secondary" DC and once it is again ok and
running I would do the same on the "primary", am I right?

Thanks in advance,
Daniele.