Canonical please read Theodore Tso's Comment #4 above, and consider for
Ubuntu 18.04 LTS!
This "64bit,metadata_csum" creates compatibility-issues even with 16.04
LTS, and does not seem to provide a huge benefit [>16TB fs support,
slightly stronger metadata checksumming].
This creates all sorts of problems for compatibility/portability of
filesystems, e.g.:-
* dual-booting 18.04, even previous LTS version cannot fsck the filesystem.
* "ext4 portable disks" created by 18.04 similarly same problem.
* Also consider how wide is the 64bit,metadata_csum support anyway, users may
want disks to work with many distros/drivers? Canonical's
commercial-supporters may have views herein?. -- the linked bugreport also
mentions another issue with hwe-edge and LVM.
Also note, turning off the 64bit,metadata_csum when required is a total
PAIN, needing filesystem offline, fsck and tune2fs in careful
concert.....
In my view, the 16.04 LTS mke2fs.conf [ ext4{} stanza with
"auto_64-bit_support = 1" and NO "64bit,metadata_csum" in "features" ]
should be seriously-considered for 18.04 "LTS" (even if 18.10 onwards follow
Debian).
As tytso says, this 'change' has been "Decision-by-Default" due to
importing a Debian upstream package, I would like Canonical to make an
'informed and considered decision' about this please!.
Hope that helps!
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to e2fsprogs in Ubuntu.
https://bugs.launchpad.net/bugs/1601997
Title:
Ubuntu 16.10 installer sets metadata_csum option on ext4 partition
which is incompatible with other LTS Ubuntu versions
Status in e2fsprogs package in Ubuntu:
Triaged
Bug description:
Ubuntu 16.10 installer sets metadata_csum option on ext4 partition
which is incompatible with other LTS Ubuntu versions (12.04 LTS, 14.04
LTS, 16.04 LTS).
Steps to reproduce:
1. Download Ubuntu 16.10 installation media.
2. Install Ubuntu.
3. Try to do fsck -fy /dev/sdX1 from other supported Ubuntu distro.
Expected results:
User can check and fix errors on ext4 filesystem, created on Ubuntu 16.10.
Actual results:
User can not check and fix errors on ext4 filesystem because of lack of
'metadata_csum' option in previous LTS Ubuntu versions.
The only one working solution was to scan from 16.10 live install media.
Note:
it is known, that Dan Watkins disabled metadata_csum when creating ext4
filesystems ( see
http://bazaar.launchpad.net/~daniel-thewatkins/maas-images/fix-yakkety-builds/revision/305
). It is good solution.
ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: e2fsprogs 1.43.1-1
ProcVersionSignature: Ubuntu 4.4.0-30.49-generic 4.4.13
Uname: Linux 4.4.0-30-generic i686
ApportVersion: 2.20.2-0ubuntu1
Architecture: i386
CurrentDesktop: Unity
Date: Mon Jul 11 23:42:49 2016
SourcePackage: e2fsprogs
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/ubuntu/+source/e2fsprogs/+bug/1601997/+subscriptions
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