개발 공부

✅ Quorum exists to safely stop cluster services on nodes that are isolated or failed, to protect data integrity. No quorum = no right to operate.✅ RHS (Resource Host Subsystem) is used by healthy nodes in the cluster to manage failover, such as migrating VMs when a node goes down. 🧠 The Core PrincipleWindows Failover Cluster evicts a node not because it's powered off, but because it's no longer..

✅ Where Does Each Node Write Data in an S2D CSV Cluster?🧱 On S2D + CSV:Each node has local disks (SSD/NVMe/HDD) that form a Storage Pool.S2D makes a virtual disk (resilient via mirroring or parity) using all nodes’ drives.CSV allows all nodes to access this virtual disk simultaneously.🔄 Where Is Data Written?Any node can write I/O locally to a CSV.That I/O is sent through the S2D fabric, and d..

🔷 What Is Quorum?Quorum is the mechanism that prevents split-brain — where multiple parts of a cluster think they’re in charge and cause data corruption.In simple terms:👉 Quorum = Majority agreement among voting members (nodes + witness) about which part of the cluster should stay online.If quorum is not reached, the cluster shuts down (partially or completely) to protect data. 🔹 File Share W..

Step 1: Deploy Windows ServerStep 1.1: Install the operating systemStep 1.2: Connect to the serversStep 1.3: Join the domain and add domain accountsStep 1.4: Install roles and features Step 2: Configure the networkStep 3: Configure Storage Spaces DirectStep 3.1: Clean drives# Fill in these variables with your values$ServerList = "Server01", "Server02", "Server03", "Server04"foreach ($server in $..

🔹 What is a Witness in Clustering?A witness acts as a “tie-breaker” to help the cluster reach quorum (i.e., majority agreement among nodes) in the event of a node or site failure.Without quorum, the cluster goes offline to prevent data corruption or “split-brain.”🔸 1. Cloud WitnessFeatureDetailsLocationMicrosoft Azure (uses Azure Blob Storage)Use CaseIdeal for multi-site clusters or when you w..

🔹 Key Storage Terms:1. SAN (Storage Area Network)Type: ArchitectureWhat: A high-speed network that connects servers to block-level storage (often via Fibre Channel or iSCSI).Key concept: Storage is external to the servers.Common in: Enterprise environments before hyperconverged systems.Example component: LUNs.2. NAS (Network Attached Storage)Type: ArchitectureWhat: A storage system that provide..

The storage can use Fibre Channel, iSCSI, FCoE, or SAS for shared disk storage, or use locally attached storage with Storage Spaces Direct (S2D).Storage Spaces Direct (S2D) is a storage technology that combines multiple servers and storage media into a single cluster, essentially creating a virtual storage pool. S2D, or Storage Spaces Direct, is a Windows Server feature that uses a cluster of s..

The Resilient File System (ReFS) is a file system developed by Microsoft, designed for use on Windows operating systems. It aims to improve upon the existing New Technology File System (NTFS) by enhancing data integrity, availability, and scalability. ReFS is particularly useful for scenarios involving large datasets and virtualized environments. You can format a drive as ReFS (Resilient File Sy..

Safety and security through redundancyRedundancy is a fundamental concept in the context of failover clustering, and it refers to the inclusion of duplicate components or systems within a cluster to ensure reliability and fault tolerance. The primary goal of redundancy is to eliminate single points of failure, which are vulnerabilities in a system that could lead to service interruptions or data..

In a failover cluster, the failover mechanism is the process by which workloads are automatically shifted from a failing node to a healthy node in the cluster. This ensures minimal disruption to services and maintains high availability. The mechanism involves monitoring the health of each node and, upon detecting a failure, transferring the workload to another node. Here's a more detailed expla..