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

[jrs]

I'm using the kernel provided with the latest lustre rpms (1.6.4.3), so
it's
mds02:~ # uname -a
Linux mds02 2.6.16-54-0.2.5_lustre.1.6.4.3smp #1 SMP Sun Feb 17 10:24:52 EST 2008 x86_64 x86_64 x86_64 GNU/Linux

John

Kalpak Shah wrote:
> 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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>