Hello
reinstalling with ext3 'fixes' it
-------- Forwarded Message --------
Subject: debian 9 ext4 wont mount on debian 7
Date: Sun, 28 Apr 2019 23:24:58 +0700
From: TJoseph Powderly <tjt...@gmail.com>
To: emc-users <emc-users@lists.sourceforge.net>
Hello
I just installed
http://www.linuxcnc.org/testing-stretch-rtpreempt/linuxcnc-stretch-uspace-amd64-r13.iso
I reformatted a partition as ext4 to hold this installation.
Then I made a screenshot of latency-histogram
and rebooted to my workhorse debian 7 to compare latencies.
I found I could not mount the debian 9 ext4 partition from the debian 7
system.
Then I read that theres changes in the ext4 fs that cause this. ( its a
known problem ).
Then I 'fixed' the problem by booting the debian 9 and issuing sudo
tune2fs -O ^metadata_csum /dev/sda1 ( sda1 for my installation ymv )
////
That did not really work.
I ended up wiping the install , reinstalling with ext3
now debian 7, debian 8, debian 9 and ubuntu 16 can all read and write
each others' partitions.
////
please warn others on the install pages that formatting a partition as
ext4 will be problematic when accessed by older debians.
////
it's not a linuxcnc problem
the problem is debian 9 has a different ext4 than earlier debians
the bad suggestion to use ext4 is inside the debian installer.
////
thanks TomP
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