[Lustre-discuss] Unable to activate OST

[Dusty Marks]

Greetings,

I'm trying to get Lustre 1.8.1.1 working, but have been running into nothing
but trouble.

Long story short, i'm trying to mount the OST on the OSS, but i keep getting
this error:

[root at oss ~]# mount -t lustre /dev/lustre/OST /lustre/OSS
mount.lustre: mount /dev/lustre/OST at /lustre/OSS failed: Input/output
error
Is the MGS running?

What i don't understand is, the MGS is running as far as i know. I followed
this guide
http://manual.lustre.org/manual/LustreManual16_HTML/ConfiguringLustreExamples.html.
After that didn't work, i tried this guide
http://unixfoo.blogspot.com/2009/11/lustre-cluster-filesystem-quick-setup.html,
and that didn't work either. I have the MDS and MGS on the same system.

In the below walk-through of what i've done from start to finish, it is
clear that i mounted the MGS partition, which, if i understand lustre
correctly, should start the MGS service, yet the OSS complains with an I/O
error.

I've been struggling with this for some time, and am near giving up. Any
help will be greatly appreciated.


Thanks,
Dusty

------------ here is what i typed in on the mds server (and its output).
-------------
[root at mds ~]# nano /etc/modprobe.conf
[root at mds ~]# pvcreate /dev/hdb1
  Physical volume "/dev/hdb1" successfully created
[root at mds ~]# vgcreate lustre /dev/hdb1
  Volume group "lustre" successfully created
[root at mds ~]# lvcreate -L 19G -n MGS lustre
  Logical volume "MGS" created
[root at mds ~]# mkfs.lustre --mgs /dev/lustre/MGS

   Permanent disk data:
Target:     MGS
Index:      unassigned
Lustre FS:  lustre
Mount type: ldiskfs
Flags:      0x74
              (MGS needs_index first_time update )
Persistent mount opts: errors=remount-ro,iopen_nopriv,user_xattr
Parameters:

checking for existing Lustre data: not found
device size = 19456MB
2 6 18
formatting backing filesystem ldiskfs on /dev/lustre/MGS
    target name  MGS
    4k blocks     0
    options        -J size=400 -q -O dir_index,extents,uninit_groups -F
mkfs_cmd = mke2fs -j -b 4096 -L MGS  -J size=400 -q -O
dir_index,extents,uninit_groups -F /dev/lustre/MGS
Writing CONFIGS/mountdata
[root at mds ~]# mount -t lustre /dev/lustre/MGS /lustre/MGS/

[root at mds ~]# lvcreate -L 18G -n MDT lustre
  Logical volume "MDT" created
[root at mds ~]# mkfs.lustre --fsname=datafs --mdt --reformat
--mgsnode=192.168.0.2 at tcp0 /dev/lustre/MDT

   Permanent disk data:
Target:     datafs-MDTffff
Index:      unassigned
Lustre FS:  datafs
Mount type: ldiskfs
Flags:      0x71
              (MDT needs_index first_time update )
Persistent mount opts: errors=remount-ro,iopen_nopriv,user_xattr
Parameters: mgsnode=192.168.0.2 at tcp mdt.group_upcall=/usr/sbin/l_getgroups

device size = 18432MB
2 6 18
formatting backing filesystem ldiskfs on /dev/lustre/MDT
    target name  datafs-MDTffff
    4k blocks     0
    options        -J size=400 -i 4096 -I 512 -q -O
dir_index,extents,uninit_groups -F
mkfs_cmd = mke2fs -j -b 4096 -L datafs-MDTffff  -J size=400 -i 4096 -I 512
-q -O dir_index,extents,uninit_groups -F /dev/lustre/MDT
Writing CONFIGS/mountdata
[root at mds ~]# mkdir /lustre/MDT
[root at mds ~]# mount -t lustre /dev/lustre/MDT /lustre/MDT


------------ Here is exactly what i typed in on the OSS server, as well as
what was output. -------------------
[root at oss ~]# pvcreate /dev/hdc1
  Physical volume "/dev/hdc1" successfully created
[root at oss ~]# vgcreate lustre /dev/hdc1
  /dev/hdb: open failed: No medium found
  Volume group "lustre" successfully created
[root at oss ~]# vgs
  VG         #PV #LV #SN Attr   VSize  VFree
  VolGroup00   1   2   0 wz--n- 74.41G     0
  lustre       1   0   0 wz--n- 37.27G 37.27G
[root at oss ~]# lvcreate -n OST -L 37GB lustre
  Logical volume "OST" created
[root at oss ~]# mkfs.lustre --fsname=datafs --ost
--mgsnode=192.168.0.2 at tcp0/dev/lustre/OST

   Permanent disk data:
Target:     datafs-OSTffff
Index:      unassigned
Lustre FS:  datafs
Mount type: ldiskfs
Flags:      0x72
              (OST needs_index first_time update )
Persistent mount opts: errors=remount-ro,extents,mballoc
Parameters: mgsnode=192.168.0.2 at tcp

checking for existing Lustre data: not found
device size = 37888MB
2 6 18
formatting backing filesystem ldiskfs on /dev/lustre/OST
    target name  datafs-OSTffff
    4k blocks     0
    options        -J size=400 -i 16384 -I 256 -q -O
dir_index,extents,uninit_groups -F
mkfs_cmd = mke2fs -j -b 4096 -L datafs-OSTffff  -J size=400 -i 16384 -I 256
-q -O dir_index,extents,uninit_groups -F /dev/lustre/OST
Writing CONFIGS/mountdata
[root at oss ~]# mkdir -p /lustre/OSS
[root at oss ~]# mount -t lustre /dev/lustre/OST /lustre/OSS
mount.lustre: mount /dev/lustre/OST at /lustre/OSS failed: Input/output
error
Is the MGS running?


-- 
The graduate with a Science degree asks, "Why does it work?" The graduate
with an Engineering degree asks, "How does it work?" The graduate with an
Accounting degree asks, "How much will it cost?" The graduate with an Arts
degree asks, "Do you want fries with that?"
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