I reformat a mdt partition and it seems to work. But when I try to do
another mkfs.lustre, it complained that ther eis still lustre data on
the partition and asked me to reformat it. Any ideas? 

[EMAIL PROTECTED] ~]# mkfs.lustre --fsname=lustrefs --mdt --mgs --reformat
/dev/hda10

   Permanent disk data:
Target:     lustrefs-MDTffff
Index:      unassigned
Lustre FS:  lustrefs
Mount type: ldiskfs
Flags:      0x75
              (MDT MGS needs_index first_time update )
Persistent mount opts: errors=remount-ro,iopen_nopriv,user_xattr
Parameters:

device size = 39MB
formatting backing filesystem ldiskfs on /dev/hda10
        target name  lustrefs-MDTffff
        4k blocks     0
        options        -i 4096 -I 512 -q -O dir_index -F
mkfs_cmd = mkfs.ext2 -j -b 4096 -L lustrefs-MDTffff  -i 4096 -I 512 -q
-O dir_index -F /dev/hda10
Writing CONFIGS/mountdata




[EMAIL PROTECTED] ~]# mkfs.lustre --fsname=lustrefs --mdt --mgs --mkfsoptions
-i 2048 /dev/hda10

   Permanent disk data:
Target:     lustrefs-MDTffff
Index:      unassigned
Lustre FS:  lustrefs
Mount type: ldiskfs
Flags:      0x75
              (MDT MGS needs_index first_time update )
Persistent mount opts: errors=remount-ro,iopen_nopriv,user_xattr
Parameters:

checking for existing Lustre data
found Lustre data

mkfs.lustre FATAL: Device /dev/hda10 was previously formatted for
lustre. Use --reformat to reformat it, or tunefs.lustre to modify.

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