Ceph allows you to replace existing SAN storage (or SAN drop-in substitutes) with a flexible storage solution with real scale-out capabilities. Here is how you migrate existing virtual machines managed by libvirt from block-based storage to a Ceph based storage solution.

Prerequisites

What you’ll need in order to successfully …

In a Pacemaker cluster, as in a standalone system, operators must complete maintenance tasks such as software upgrades and configuration changes. Here’s what you need to keep Pacemaker’s built-in monitoring features from creating unwanted side effects.

Maintenance mode

This is quite possibly Pacemaker’s single most useful feature …

If you’ve heard of Ceph, you’ve surely heard of radosgw, a RESTful gateway interface to the RADOS object store. You’ve probably also heard that it provides a front-end interface that is compatible with Amazon’s S3 API.

The question remains, if you have an S3 client that …

For users of VMware virtualization, it’s becoming increasingly common to deploy Pacemaker clusters within the virtual infrastructure. Doing this requires that you set up fencing via ESX Server or, more commonly, vCenter. Here’s how to do that.

The cluster-glue package contains node Pacemaker’s fencing (STONITH) plugins, one …

Ever wonder what’s the difference between order <name> inf: <first-resource> <second-resource> and a score of something other than inf? We’ll explain.

If you specify an order constraint score of INFINITY (inf or the keyword mandatory in crm shell syntax), then the order constraint is considered mandatory. If you …