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
[root@client1 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)
[root@client1 administrator]#

... and...

df -h
[root@client1 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
[root@client1 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
[root@client1 administrator]# ls -l /mnt/glusterfs
total 1024032
-rw-r--r-- 1 root root 1048576000 2009-12-22 17:31 test.img
[root@client1 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
[root@server1 administrator]# ls -l /data/export
total 256008
-rw-r--r-- 1 root root 1045430272 2009-12-22 17:31 test.img
[root@server1 administrator]#

server2.example.com:

ls -l /data/export
[root@server2 administrator]# ls -l /data/export
total 256008
-rw-r--r-- 1 root root 1046478848 2009-12-22 17:27 test.img
[root@server2 administrator]#

server3.example.com:

ls -l /data/export
[root@server3 administrator]# ls -l /data/export
total 256008
-rw-r--r-- 1 root root 1047527424 2009-12-22 17:26 test.img
[root@server3 administrator]#

server4.example.com:

ls -l /data/export
[root@server4 administrator]# ls -l /data/export
total 256008
-rw-r--r-- 1 root root 1048576000 2009-12-22 17:30 test.img
[root@server4 administrator]#

 

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