Lustre Configuration Example

This Lustre configuration example illustrates the configuration steps for a simple Lustre installation comprising a combined MGS/MDT, an OST and a client, where:

1. Define the module options for Lustre networking (LNET), by adding this line to the /etc/modprobe.conf file.

options lnet networks=tcp

2. Create a combined MGS/MDT file system on the block device. On the MDS node, run:

[root@mds /]# mkfs.lustre --fsname=temp --mgs --mdt /dev/sdb

This command generates this output:

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

checking for existing Lustre data: not found device size = 16MB 2 6 18 formatting backing filesystem ldiskfs on /dev/sdb target name  temp-MDTffff 4k blocks    0 options      -i 4096 -I 512 -q -O dir_index,uninit_groups -F mkfs_cmd = mkfs.ext2 -j -b 4096 -L temp-MDTffff -i 4096 -I 512 -q -O dir_index,uninit_groups -F /dev/sdb Writing CONFIGS/mountdata

3. Mount the combined MGS/MDT file system on the block device. On the MDS node, run:

[root@mds /]# mount -t lustre /dev/sdb /mnt/mdt

This command generates this output:

Lustre: temp-MDT0000: new disk, initializing Lustre: 3009:0:(lproc_mds.c:262:lprocfs_wr_group_upcall) \ temp-MDT0000: group upcall set to /usr/sbin/l_getgroups Lustre: temp-MDT0000.mdt: set parameter \ group_upcall=/usr/sbin/l_getgroups Lustre: Server temp-MDT0000 on device /dev/sdb has started

4. Create the OST. On the OSS node, run:

[root@oss1 /]# mkfs.lustre --ost --fsname=temp --mgsnode= 10.2.0.1@tcp0 /dev/sdb

The command generates this output:

Permanent disk data: Target:     temp-OSTffff Index:      unassigned Lustre FS:  temp Mount type: ldiskfs Flags:      0x72 (OST needs_index first_time update) Persistent mount opts: errors=remount-ro,extents,mballoc Parameters: mgsnode=10.2.0.1@tcp

checking for existing Lustre data: not found device size = 16MB 2 6 18 formatting backing filesystem ldiskfs on /dev/sdc target name   temp-OSTffff 4k blocks     0 options       -I 256 -q -O dir_index,uninit_groups -F mkfs_cmd = mkfs.ext2 -j -b 4096 -L temp-OSTffff -I 256 -q -O dir_index,uninit_groups -F /dev/sdc Writing CONFIGS/mountdata

5. Mount the OST. On the OSS node, run:

root@oss1 /] mount -t lustre /dev/sdb /mnt/ost1

The command generates this output:

LDISKFS-fs: file extents enabled LDISKFS-fs: mballoc enabled Lustre: temp-OST0000: new disk, initializing Lustre: Server temp-OST0000 on device /dev/sdb has started

Shortly afterwards, this output appears:

Lustre: temp-OST0000: received MDS connection from 10.2.0.1@tcp0 Lustre: MDS temp-MDT0000: temp-OST0000_UUID now active, resetting orphans

6. Mount the file system on the client. On the client node, run:

root@client1 /] mount -t lustre 10.2.0.1@tcp0:/temp /lustre

This command generates this output:

Lustre: Client temp-client has started

7. Verify that the file system started and is working by running the UNIX commands df, dd and ls on the client node.

a. Run the df command:




 * [root@client1 /] df -h


 * This command generates output similar to:




 * Filesystem          Size   Used   Avail   Use%  Mounted on
 * /dev/mapper/VolGroup00-LogVol00
 * 7.2G  2.4G   4.5G     35%   /
 * dev/sda1             99M    29M    65M     31%   /boot
 * tmpfs                62M     0     62M      0%   /dev/shm
 * 10.2.0.1@tcp0/&#58;temp  30M   8.5M    20M     30%   /lustre

b. Run the dd command:




 * [root@client1 /] cd /lustre
 * [root@client1 /lustre] dd if=/dev/zero of=/lustre/zero.dat bs=4M
 * count=2


 * This command generates output similar to:




 * 2+0 records in
 * 2+0 records out
 * 8388608 bytes (8.4 MB) copied, 0.159628 seconds, 52.6 MB/s

c. Run the ls command:




 * [root@client1 /lustre] ls -lsah


 * This command generates output similar to:




 * total 8.0M
 * 4.0K drwxr-xr-x 2 root root 4.0K Oct 16 15&#58;27.
 * 8.0K drwxr-xr-x 25 root root 4.0K Oct 16 15&#58;27 ..
 * 8.0M -rw-r--r-- 1 root root 8.0M Oct 16 15&#58;27 zero.dat