Striping Across Four Storage Nodes With GlusterFS On Mandriva 2010.0 - Page 2

3 Setting Up The GlusterFS Client

client1.example.com:

On the client, we can install the GlusterFS client as follows:

urpmi glusterfs-client glusterfs-server

Then we create the following directory:

mkdir /mnt/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

[[email protected] administrator]# mount
/dev/sda1 on / type ext4 (rw,relatime)
none on /proc type proc (rw)
/dev/sda6 on /home type ext4 (rw,relatime)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
rpc_pipefs on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
nfsd on /proc/fs/nfsd type nfsd (rw)
/etc/glusterfs/glusterfs.vol on /mnt/glusterfs type fuse.glusterfs (rw,allow_other,default_permissions,max_read=131072)
[[email protected] administrator]#

... and...

df -h

[[email protected] administrator]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1              12G  1.5G  9.8G  13% /
/dev/sda6              16G  172M   16G   2% /home
/etc/glusterfs/glusterfs.vol
                      116G  1.7G  114G   1% /mnt/glusterfs
[[email protected] administrator]#

(server1.example.com, server2.example.com, server3.example.com, and server4.example.com each have about 29GB of space for the GlusterFS filesystem, so that the resulting share has a size of about 4 x 29GB (116GB).)

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

[[email protected] administrator]# ls -l /mnt/glusterfs
total 1024032
-rw-r--r-- 1 root root 1048576000 2009-12-22 17:31 test.img
[[email protected] administrator]#

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

[[email protected] administrator]# ls -l /data/export
total 256008
-rw-r--r-- 1 root root 1045430272 2009-12-22 17:31 test.img
[[email protected] administrator]#

server2.example.com:

ls -l /data/export

[[email protected] administrator]# ls -l /data/export
total 256008
-rw-r--r-- 1 root root 1046478848 2009-12-22 17:27 test.img
[[email protected] administrator]#

server3.example.com:

ls -l /data/export

[[email protected] administrator]# ls -l /data/export
total 256008
-rw-r--r-- 1 root root 1047527424 2009-12-22 17:26 test.img
[[email protected] administrator]#

server4.example.com:

ls -l /data/export

[[email protected] administrator]# ls -l /data/export
total 256008
-rw-r--r-- 1 root root 1048576000 2009-12-22 17:30 test.img
[[email protected] administrator]#

 

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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