Am Dienstag, 21. August 2018 schrieb Slávek Banko:
> Dne út 21. srpna 2018 Nick Koretsky napsal(a):
> > On Tue, 21 Aug 2018 09:08:55 -0400
> >
> > Gene Heskett <gheskett@...> wrote:
> > > On Tuesday 21 August 2018 08:21:12 Nick Koretsky wrote:
> > > > On Tue, 21 Aug 2018 12:55:28 +0200
> > > >
> > > > "Dr. Nikolaus Klepp" <office@...> wrote:
> > > > > Am Dienstag, 21. August 2018 schrieb Nick Koretsky:
> > > > > > On Tue, 21 Aug 2018 09:20:43 +0200
> > > > > >
> > > > > > "Dr. Nikolaus Klepp" <office@...> wrote:
> > > > > > > > Its tears so far Nik. There are so many differences just in
> > > > > > > > the ext4's used that one of them should be renamed, they
> > > > > > > > will NOT cross mount, ext4 disk to ext4 mount.
> > > > > > >
> > > > > > > Hi Gene!
> > > > > > >
> > > > > > > When you cannot mount the ext4 partions from one another,
> > > > > > > then there is something very wrong. ext4 can be mounted as
> > > > > > > ext2 and that should alway work - at least, if the drives and
> > > > > > > filesystems are ok.
> > > > > >
> > > > > > No, you are wrong. There were options added to ext4 which made
> > > > > > it incompatible with older kernels. And a few years ago they
> > > > > > made this options default. Debian wheezy kernel (3.2) would not
> > > > > > mount ext4 created in debian stretch.
> > > > >
> > > > > Hi!
> > > > >
> > > > > Now that's a gotcha I did not know. How did it come that this was
> > > > > thought of beeing a good idea?
> > > > >
> > > > > Nik
> > > >
> > > > Yep. Exactly my thought when i spent 3-hours with a server refusing
> > > > to boot after migration to a new hdd (i used a stretch flash to
> > > > copy). Who the fuck toughs it was a good idea?!! Why not call it
> > > > ext5 or ext4a or whatever?!!
> > >
> > > +100
> > >
> > > Now the question of the day is how the hell do we fix it?
> >
> > If you need a shared partition between wheezy and stretch create it in
> > wheezy.
> 
> I recommend upgrading to wheezy-backports kernel.
> 
> Cheers

Maybe I missed the point somewhere, but I was under the impression that Gene wants to run linuxcnc on a production machine, and that needs a realtime kernel. To be more prcise, linuxcnc 2.7 needs a rtai patched kernel if you want decent latentcy, not the rtpreempt kernels from debian. I have now two mills running on devuan ascii, both with the old kernels from linuxcnc-wheezy 'cause of latency.

Nik



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