[LU-2732] LDISKFS-fs (sdb1): couldn't mount RDWR because of unsupported optional features (100)

• Type: Bug
• Resolution: Done
• Priority: Major
• Affects Version/s: Lustre 2.4.0
• Environment: before upgrade client and server: 2.1.4 RHEL6; after upgrade client and server: lustre-master build #1194 RHEL6
• Severity: 3
• Assignee: Hongchao Zhang
• Reporter: Sarah Liu

Description

After upgrade the whole system from 2.1.4 to 2.4, then downgrade to 2.1.4 again, cannot mount MDS, got following error messages:

[root@fat-amd-1 ~]# mount -t lustre -o acl,user_xattr /dev/sdb1 /mnt/mds1
LDISKFS-fs warning (device sdb1): ldiskfs_fill_super: extents feature not enabled on this filesystem, use tune2fs.
LDISKFS-fs (sdb1): couldn't mount RDWR because of unsupported optional features (100)
LustreError: 8077:0:(obd_mount.c:1360:server_kernel_mount()) premount /dev/sdb1:0x0 ldiskfs failed: -22 Is the ldiskfs module available?
LustreError: 8077:0:(obd_mount.c:1700:server_fill_super()) Unable to mount device /dev/sdb1: -22
LustreError: 8077:0:(obd_mount.c:2198:lustre_fill_super()) Unable to mount  (-22)
mount.lustre: mount /dev/sdb1 at /mnt/mds1 failed: Invalid argument
This may have multiple causes.
Are the mount options correct?
Check the syslog for more info.