Tag
failover
- Jul 29, 2026 Leader Leases and Fencing Tokens in Failover Why a demoted leader can still issue writes, how time-based leases bound that window, and why fencing tokens rather than timeouts are what actually protects shared storage. distributed systems
- Jul 27, 2026 Decomposing the Failover Time Budget How detection delay, decision quorum, promotion, and traffic redirection add up into a recovery time, and which of the four terms an operator can actually shorten. cloud infrastructure
- Mar 21, 2026 Fencing and Quorum in Automated Failover Why a new primary must be able to prove the old one cannot write, how leases fail when a machine is paused rather than dead, and where quorum buys safety more cheaply. devops
- Nov 25, 2025 Replication Topologies and What Each One Tolerates How single-leader, multi-leader, and leaderless replication differ in where writes are accepted, which node losses they survive, and what conflict handling each one forces. distributed systems
- Nov 21, 2025 Cross-Region Replication and the Window Between Two Copies Replication is asynchronous by default, so the second region lags the first. What the lag does to failover, to deletes, and to any read that crosses the boundary. cloud infrastructure
- Nov 7, 2025 Sizing Regional Capacity for the Loss of a Region Why N+1 regional capacity is larger than the arithmetic suggests, how queueing turns the last few percent of utilization into latency, and where failover load comes from. cloud infrastructure
- Oct 21, 2025 Leader Failover: Detection Windows, Fencing, and Split-Brain Avoidance How a failed leader is detected, why a timeout cannot distinguish a dead leader from a slow one, and how fencing tokens stop two leaders from accepting writes. databases
- Sep 5, 2025 Chain Replication: Why the Head Writes and the Tail Reads How ordering replicas into a chain turns replication into a single ordered path, why reads are served at the tail, and what the head and tail failures require of the membership protocol. filesystems
- Apr 18, 2025 DNS Failover and the Resolver Caching Bound How record TTLs, negative caching, and resolver behaviour put a floor under DNS-based traffic redirection, and why the observed switchover time exceeds the TTL. cloud infrastructure
- Sep 27, 2023 Synchronous and Asynchronous Replication: Where the Commit Point Sits How the moment a write is acknowledged determines durability, latency, and the amount of data a failover can lose, and why semi-synchronous replication is the usual compromise. distributed systems