In my last project at work, I had to replace NFS with GFS2 and Clustering. So in this tutorial I will show you how to create a Red Hat cluster with GFS2.

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.

Now that I am done with the implementation of RHE Cluster with GFS2, I now need to setup monitoring. As you all know, monitoring is a vital part of any environment. Even though we have a cluster of nodes setup, we still need to be aware of what is happening. I created two new commands. The first command is to emulate clustat, but through python and SNMP.

DRBD is a Linux project to provide a real-time distributed filesystem. Although it has some clustering support, it's not really a true clustered filesystem like OCFS2 or GFS2. What it provides is a mirrored copy of a block device across a network

As Google rolls out GFS2 - a major update to the custom-built file system underpinning its online infrastructure - the company's former infrastructure don sees no reason why the open source world can't follow suit.

If you are using nginx as your webserver, you are looking for a performance boost and better speed. nginx is fast by default, but you can optimize its performance and the performance of all parts (like PHP and MySQL) that work together with nginx. Here is a small, incomprehensive list of tips and tricks to configure your LEMP system (Linux, nginx, MySQL, PHP-FPM) for maximum performance.

POSIX IO is becoming a serious impediment to IO performance and scaling. POSIX is one of the standards that enabled portable programs and POSIX IO is the portion of the standard surrounding IO. But as the world of storage evolves with greatly increasing capacities and greatly increasing performance, it is time for POSIX IO to evolve or die.

Regardless of whether you're running a single MySQL server or a cluster of multiple servers, one thing you are always interested in is squeezing the maximum performance out of your system. MySQL's developers were well aware of this, and so they provided a fairly comprehensive list of performance variables that you can monitor in real time to check the health and performance of your MySQL server.

MySQLTuner is a Perl script that analyzes your MySQL performance and, based on the statistics it gathers, gives recommendations which variables you should adjust in order to increase performance. That way, you can tune your my.cnf file to tease out the last bit of performance from your MySQL server and make it work more efficiently.