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

[Kalpak Shah]

On Mon, 2008-05-05 at 16:34 -0400, jrs wrote:
> 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 ...

What is the kernel version you are using? Actually MMP is supported only
for kernel versions >= 2.6.9.

Thanks,
Kalpak

> 
> 
> 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
> 
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