[LU-5447] MGS fails to mount after 1.8 to 2.4.3 upgrade: checking for existing Lustre data: not found

Fri, 8 Aug 2014 23:16:46 +0000

After upgrading our lustre servers to lustre-2.4.3 (the exact branch can be seen at the github link below), we are not able to start the filesystem it fails at the first mount of the MGT with the messages below. A debugfs 'stats' output is attached.

The only difference I am able to notice between this filesystem and another that was successfully upgraded to 2.4.3 from 1.8.9 is that this has the flag "update" in the tunefs.lustre output. Is there a particular meaning to that?

We mounted with e2fsprogs-1.42.9 first, and then downgraded to e2fsprogs-1.42.7 and still noticed the same result. The system was last mounted as a 1.8.9 filesystem and was cleanly unmounted. The multipath configuration would have changed slightly in the rhel5 to rhel6 transition, but the block device is still readable by debugfs.

Is this related to the index not being assigned in 1.8? There were several jira tickets related, but they all appear to have been resolved in 2.4.0.

We are working on a public repo of our branch. This should be it, but the one we are running has the patch for ~~LU-5284~~:http://review.whamcloud.com/#/c/11136/

Our repo:
https://github.com/ORNL-TechInt/lustre/commits/master

[root@sns-mds1 ~]# mount -vt lustre /dev/mpath/snsfs-mgt /tmp/lustre/snsfs/sns-mgs
arg[0] = /sbin/mount.lustre
arg[1] = -v
arg[2] = -o
arg[3] = rw
arg[4] = /dev/mpath/snsfs-mgt
arg[5] = /tmp/lustre/snsfs/sns-mgs
source = /dev/mpath/snsfs-mgt (/dev/mpath/snsfs-mgt), target = /tmp/lustre/snsfs/sns-mgs
options = rw
checking for existing Lustre data: not found
mount.lustre: /dev/mpath/snsfs-mgt has not been formatted with mkfs.lustre or the backend filesystem type is not supported by this tool

[root@sns-mds1 ~]# tunefs.lustre --dryrun /dev/mapper/snsfs-mgt
checking for existing Lustre data: found
Reading CONFIGS/mountdata

Read previous values:
Target: MGS
Index: unassigned
Lustre FS: lustre
Mount type: ldiskfs
Flags: 0x54
(MGS needs_index update )
Persistent mount opts: iopen_nopriv,user_xattr,errors=remount-ro
Parameters:

Permanent disk data:
Target: MGS
Index: unassigned
Lustre FS: lustre
Mount type: ldiskfs
Flags: 0x44
(MGS update )
Persistent mount opts: iopen_nopriv,user_xattr,errors=remount-ro
Parameters:

exiting before disk write.

Whamcloud Community JIRA

[LU-5447] MGS fails to mount after 1.8 to 2.4.3 upgrade: checking for existing Lustre data: not found