At Tue, 20 Apr 2021 20:19:47 -0500 (CDT) CentOS mailing list <centos@xxxxxxxxxx> wrote:
>
> On Tue, 20 Apr 2021, Michael Hennebry wrote:
>
> > I've been trying to backup the root partition of my F33 installation.
> > To that end, I'm running a C7 live CD.
> > C7 won't mount the partition.
> > tune2fs likes it, but
> > [root@localhost mnt]# mount /dev/sda5 /mnt/a5
> > mount: wrong fs type, bad option, bad superblock on /dev/sda5,
> > missing codepage or helper program, or other error
> >
> > In some cases useful info is found in syslog - try
> > dmesg | tail or so.
> > [root@localhost mnt]# dmesg | tail -n 15
>
> > [ 146.548540] Bluetooth: BNEP socket layer initialized
> > [ 300.961319] JBD2: Unrecognised features on journal
> > [ 300.961325] EXT4-fs (sda5): error loading journal ====== WHY?
> > [ 361.930877] e1000e: enp0s25 NIC Link is Up 1000 Mbps Full Duplex, Flow
>
> I just ran fsck -n /dev/sda5 .
> [root@localhost mnt]# fsck -n /dev/sda5
> fsck from util-linux 2.23.2
> e2fsck 1.42.9 (28-Dec-2013)
> Journal superblock has an unknown incompatible feature flag set.
> Abort? no
>
> Journal superblock is corrupt.
> Fix? no
>
> fsck.ext4: The ext2 superblock is corrupt while checking ext3 journal for slash
>
> slash: ********** WARNING: Filesystem still has errors **********
>
> [root@localhost mnt]#
>
> What is going on?
> What can I do about it?
>
> Does "unknown incompatible feature flag set" imply corrupt?
No. F33 is just using a newer version of ext4 than C7 understands. You need a
F33 live CD or some other "newer" live CD. A C8 Live CD might work. A Ubuntu
20.04 Live CD will likely work.
> How dangerous would it be to let fsck fix it?
>
> I'm starting to think I might need to back up / while it is in use.
Nothing terribly wrong with that... You might not be able to backup log files
if they change during the backup, but that is hardly fatal. You want to use
something like tar and not dump...
>
--
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