In vSphere, shared storage enables multiple hosts to simultaneously access virtual machine files, ensuring uninterrupted VM operation and migration within a cluster, even if a host fails. This architecture depends on storage systems accessible by multiple servers for continuous data availability and consistency.
Comparison Between Shared Storage and Distributed Storage
- Shared Storage: Known for reliability and stability but can be costly, less scalable, and may lead to data silos.
- Distributed Storage: Spreads data across networked x86 servers, often using software like vSAN, offering scalability and cost-efficiency.
Introduction to vSAN
vSAN is VMware’s software-defined storage solution that aggregates local storage into a shared datastore without needing external devices. It integrates with ESXi to support advanced features such as HA, vMotion, and DRS, offering seamless expansion, automated policy-based management, and enhanced data protection through distributed RAID.
Core Concepts of vSAN
vSAN introduces disk groups, objects, striping, and mirroring, enhancing data distribution and fault tolerance. It supports hybrid and all-flash configurations and provides tools for health checks and performance monitoring.
Conclusion
vSAN transforms local storage into a unified, scalable, and efficient datastore, supporting seamless VM operations and improving resource utilization across clusters with robust data protection and flexible management options.