A question we see over and over again is Why is umount so slow? Why does it take so long? Part of the answer was already given in an earlier blog post; here’s some more explanation.
For the people who don’t already have DRBD 8.4.3 deployed: here’s another good reason — Performance.
Recently we’ve upgraded one of our virtualization clusters (more RAM), and in the course of this did an upgrade of the virtualization hosts from Ubuntu Lucid to RHEL 6.3 — without any service interruption.
The Raspberry PI is a small ARM computer (hardware specifications in wiki, outline and FAQs). Of course, you can build a cluster with it!
Have you ever wanted to do a file based backup of your data without impacting your application, and without stopping your HA replication? Here is one possible method.
Every now and then we get asked “why not simply use a mirrored SAN instead of DRBD”? This post shows some important differences.