On Tuesday 21 August 2018 16:55:31 Dr. Nikolaus Klepp wrote:
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@shentel.net 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@klepp.biz wrote:
Am Dienstag, 21. August 2018 schrieb Nick Koretsky: > On Tue, 21 Aug 2018 09:20:43 +0200 > > "Dr. Nikolaus Klepp" office@klepp.biz 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
My last 2 or 3 emails seem to have fallen off the edge of the planet. Anyway I have now swapped the drives around and used the bios boot menu to select a boot from what is now sdB, and its working. Next is to use this copy of gparted to reformat /dev/sdA and then see if a successful install can be done. I'd say buy me a beer but that might royally screw things up, so wish me luck (good that is) ;-) This will be about the 6th full install today. But before I reboot to do that, I'd better fix us some din-din. Maybe someone will have a better idea by then?