In order for the stack to work properly, we need to get the server ready. For now, this means installing basic toolkits such as xfsprogs for XFS maintenance tools and drbd8-utils for DRBD administrative scripts. Once this is complete, we move on to preparing LVM.
Since LVM is so highly integrated into the system, we need to perform several steps. The first is to modify the primary lvm.conf file so that it only watches certain devices, and while it does so, it never caches the result. Due to the way Linux is designed, there are several different aliases and paths that point to the same device in the /dev filesystem. To remove these extra paths, we set a very strict filter that only includes /dev/sd* and /dev/drbd* devices. ...
