[CentOS] Ext3 filesystem access after downgrade from v4.2 to v3.6

Mon Jan 23 17:15:23 UTC 2006
Peter Kjellström <cap at nsc.liu.se>

On Monday 23 January 2006 16:46, Plant, Dean wrote:
> I need to downgrade a system from Centos x4.2 to v3.6 (x86) due to
> performance problems with Arkeia Network Backup and AIT-4 tape drives.
> The backup database is stored on a v4.2 created ext3 partition. When
> accessing this partition after the downgrade, Centos complains on boot
> that
> fsck.ext3: Filesystem has unsupported feature(s) (/dev/sda5)
> *fsck: Get a newer version of e2fsck! [fail]

you can list the features with the command "tune2fs -l /dev/sda5" and toggle 
features too (read the man page). It's most likely the dir_index feature...

> If I comment the partition out of /etc/fstab the machine boots as normal
> and I can manually mount the filesystem.
> My questions are:
> If I use the v4.2 ext3 filesystem on v3.6 I am likely to corrupt the
> data?

I don't think you're running any risk of corrupting your data.


> And what is the best way fix this problem? Do as it says and try 
> and upgrade e2fsck or is there a better fix?
> Thanks
> Dean.

  Peter Kjellström               |
  National Supercomputer Centre  |
  Sweden                         | http://www.nsc.liu.se
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