vSphere High Availability is one of the primary reasons to run VMware over standalone hypervisors. When configured correctly, it automatically restarts VMs on surviving hosts when a host fails — transparently, without requiring administrator action. But “configured correctly” is doing a lot of work in that sentence. What HA Actually Does (and Doesn’t) HA monitors … Read more
The pool master is XenServer’s single management control plane for a resource pool. All XenCenter connections, all xe CLI commands that operate across the pool, all pool-level configuration changes — they all route through the pool master. Understanding what happens when it fails, and how to recover, is essential knowledge before you put XenServer into … Read more
Database Availability Groups in Exchange 2013 are the right answer for most organizations that need mailbox redundancy. But “you should use a DAG” is where most guidance stops, and the actual design decisions — how many members, which witness server, how to handle network configuration — are where people run into trouble. Two Nodes vs. … Read more