Today's tutorial will be on the infamous Quorum disk. When I first setup my GFS2 shared Cluster of 3 nodes, I was quite impressed with the fact that 3 nodes were sharing the same file system. Now that everything was up and running, I wanted to see what would happen if I brought down, 2 out of the 3 nodes in the cluster. I turned off 1st node and all was well, I was still able to access my GFS2 mount on the other 2 nodes. Then I decided to reboot the 2nd node, and guess what happened???? QUORUM DISSOLVED!!! Now on my final node the GFS2 file system was still mounted but I could not touch a file or run a ls on the mount... It just hung there!!