[Lustre-discuss] no default mmp set for MDT with --failnode

[jrs]

The docs say that specifying --failnode should automatically
set mmp on the filesystem.  I've seen it work and not work ...
It doesn't in this case ...


mds01:/net/lmd01/space/lustre # mkfs.lustre --reformat --fsname i3_lfs4 --mdt --mgs --failnode mds02 /dev/mapper/mdt_lustre03-04_00_dm_8_mds01

    Permanent disk data:
Target:     i3_lfs4-MDTffff
Index:      unassigned
Lustre FS:  i3_lfs4
Mount type: ldiskfs
Flags:      0x75
               (MDT MGS needs_index first_time update )
Persistent mount opts: errors=remount-ro,iopen_nopriv,user_xattr
Parameters: failover.node=10.200.20.58 at tcp mgsnode=10.200.20.58 at tcp mdt.group_upcall=/usr/sbin/l_getgroups

device size = 5722881MB
formatting backing filesystem ldiskfs on /dev/mapper/mdt_lustre03-04_00_dm_8_mds01
         target name  i3_lfs4-MDTffff
         4k blocks     0
         options        -J size=400 -i 4096 -I 512 -q -O dir_index -F
mkfs_cmd = mkfs.ext2 -j -b 4096 -L i3_lfs4-MDTffff  -J size=400 -i 4096 -I 512 -q -O dir_index -F /dev/mapper/mdt_lustre03-04_00_dm_8_mds01
Writing CONFIGS/mountdata

mds01:/net/lmd01/space/lustre # mount -t lustre /dev/mapper/mdt_lustre03-04_00_dm_8_mds01 /mnt/lustre/mdt

mds01:/net/lmd01/space/lustre # lctl dl
   0 UP mgs MGS MGS 5
   1 UP mgc MGC10.200.20.58 at tcp 713e72db-26b3-58d7-5424-ad0c1520c915 5
   2 UP mdt MDS MDS_uuid 3
   3 UP lov i3_lfs4-mdtlov i3_lfs4-mdtlov_UUID 4
   4 UP mds i3_lfs4-MDT0000 i3_lfs4-MDT0000_UUID 3
mds01:/net/lmd01/space/lustre # umount -t lustre -a
mds01:/net/lmd01/space/lustre # dumpe2fs -h /dev/mapper/mdt_lustre03-04_00_dm_8_mds01 |grep feat
dumpe2fs 1.40.4.cfs1 (31-Dec-2007)
Filesystem features:      has_journal resize_inode dir_index filetype needs_recovery sparse_super large_file