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