Striping Across Four Storage Nodes With GlusterFS On Debian Lenny - Page 2

3 Setting Up The GlusterFS Client

client1.example.com:

On the client, we need to install fuse and GlusterFS. Instead of installing the libfuse2 package from the Debian repository, we install a patched version with better support for GlusterFS.

First we install the prerequisites again:

aptitude install sshfs build-essential flex bison byacc libdb4.6 libdb4.6-dev

Then we build fuse as follows (you can find the latest patched fuse version on ftp://ftp.zresearch.com/pub/gluster/glusterfs/fuse/):

cd /tmp
wget ftp://ftp.zresearch.com/pub/gluster/glusterfs/fuse/fuse-2.7.4glfs11.tar.gz
tar -zxvf fuse-2.7.4glfs11.tar.gz
cd fuse-2.7.4glfs11
./configure
make && make install

Afterwards we build GlusterFS (just like on the server)...

cd /tmp
wget http://ftp.gluster.com/pub/gluster/glusterfs/2.0/LATEST/glusterfs-2.0.1.tar.gz
tar xvfz glusterfs-2.0.1.tar.gz
cd glusterfs-2.0.1
./configure --prefix=/usr > /dev/null

make && make install
ldconfig
glusterfs --version

... and create the following two directories:

mkdir /mnt/glusterfs
mkdir /etc/glusterfs

Next we create the file /etc/glusterfs/glusterfs.vol:

vi /etc/glusterfs/glusterfs.vol

volume remote1
  type protocol/client
  option transport-type tcp/client
  option remote-host server1.example.com
  option remote-subvolume brick
end-volume

volume remote2
  type protocol/client
  option transport-type tcp/client
  option remote-host server2.example.com
  option remote-subvolume brick
end-volume

volume remote3
  type protocol/client
  option transport-type tcp/client
  option remote-host server3.example.com
  option remote-subvolume brick
end-volume

volume remote4
  type protocol/client
  option transport-type tcp/client
  option remote-host server4.example.com
  option remote-subvolume brick
end-volume

volume stripe
  type cluster/stripe
  option block-size 1MB
  subvolumes remote1 remote2 remote3 remote4
end-volume

volume writebehind
  type performance/write-behind
  option window-size 1MB
  subvolumes stripe
end-volume

volume cache
  type performance/io-cache
  option cache-size 512MB
  subvolumes writebehind
end-volume

Make sure you use the correct server hostnames or IP addresses in the option remote-host lines!

That's it! Now we can mount the GlusterFS filesystem to /mnt/glusterfs with one of the following two commands:

glusterfs -f /etc/glusterfs/glusterfs.vol /mnt/glusterfs

or

mount -t glusterfs /etc/glusterfs/glusterfs.vol /mnt/glusterfs

You should now see the new share in the outputs of...

mount

client1:~# mount
/dev/sda1 on / type ext3 (rw,errors=remount-ro)
tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
udev on /dev type tmpfs (rw,mode=0755)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
fusectl on /sys/fs/fuse/connections type fusectl (rw)
/etc/glusterfs/glusterfs.vol on /mnt/glusterfs type fuse.glusterfs (rw,max_read=131072,allow_other,default_permissions)
client1:~#

... and...

df -h

client1:~# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1              29G  896M   27G   4% /
tmpfs                 126M     0  126M   0% /lib/init/rw
udev                   10M   80K   10M   1% /dev
tmpfs                 126M     0  126M   0% /dev/shm
/etc/glusterfs/glusterfs.vol
                      105G  3.4G   96G   4% /mnt/glusterfs
client1:~#

(server1.example.com, server2.example.com, server3.example.com, and server4.example.com each have about 26GB of space for the GlusterFS filesystem, so that the resulting share has a size of about 4 x 26GB (105GB).)

Instead of mounting the GlusterFS share manually on the client, you could modify /etc/fstab so that the share gets mounted automatically when the client boots.

Open /etc/fstab and append the following line:

vi /etc/fstab

[...]
/etc/glusterfs/glusterfs.vol  /mnt/glusterfs  glusterfs  defaults  0  0

To test if your modified /etc/fstab is working, reboot the client:

reboot

After the reboot, you should find the share in the outputs of...

df -h

... and...

mount

 

4 Testing

Now let's create a big test file on the GlusterFS share:

client1.example.com:

dd if=/dev/zero of=/mnt/glusterfs/test.img bs=1024k count=1000

ls -l /mnt/glusterfs

client1:~# ls -l /mnt/glusterfs
total 1028032
-rw-r--r-- 1 root root 1048576000 2009-06-03 20:51 test.img
client1:~#

Now let's check the /data/export directory on server1.example.com, server2.example.com, server3.example.com, and server4.example.com. You should see the test.img file on each node, but with different sizes (due to data striping):

server1.example.com:

ls -l /data/export

server1:~# ls -l /data/export
total 257008
-rw-r--r-- 1 root root 1045430272 2009-06-03 20:51 test.img
server1:~#

server2.example.com:

ls -l /data/export

server2:~# ls -l /data/export
total 257008
-rw-r--r-- 1 root root 1046478848 2009-06-03 20:55 test.img
server2:~#

server3.example.com:

ls -l /data/export

server3:~# ls -l /data/export
total 257008
-rw-r--r-- 1 root root 1047527424 2009-06-03 20:54 test.img
server3:~#

server4.example.com:

ls -l /data/export

server4:~# ls -l /data/export
total 257008
-rw-r--r-- 1 root root 1048576000 2009-06-03 20:02 test.img
server4:~#

 

Falko Timme

About Falko Timme

Falko Timme is an experienced Linux administrator and founder of Timme Hosting, a leading nginx business hosting company in Germany. He is one of the most active authors on HowtoForge since 2005 and one of the core developers of ISPConfig since 2000. He has also contributed to the O'Reilly book "Linux System Administration".

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