VMware vSAN (formerly Virtual SAN) is a hyper-converged, software-defined storage (SDS) product developed by VMware that pools together direct-attached storage devices across a VMware vSphere cluster to create a distributed, shared data store. The user defines the storage requirements, such as performance and availability, for virtual machines (VMs) on a VMware vSAN cluster and vSAN ensures that these policies are administered and maintained.
Important features
VMware vSAN includes a number of key features, although the feature set varies depending on the license type. Some of vSAN's key features are Storage Policy-Based Management, stretched clusters, checksum and software-defined data-at-rest encryption which does not require self-encrypting drive (SEDs).
vSAN 6.6 claims to deliver 50% more IOPS than previous versions of vSAN because of the way it minimizes storage latency through the use of server-side flash devices. It also includes a new health check feature that enables the administrator to see at a glance whether or not the vSAN cluster is healthy and, if it detects a problem, help diagnose the issue.
A vSAN cluster can include between 2 and 64 nodes. The vSAN 6.6 Enterprise license offers stretched clusters with local site protection, and native data-at-rest encryption designed to achieve higher availability and security with minimal CPU overhead. Both Advanced and Enterprise licenses support deduplication, compression and erasure coding data services for all-flash configurations. Erasure coding can be configured with either single or double parity protection against disk failures.
All the vSAN licenses also offer support for storage quality of service (QoS), which enables an administrator to place limits on the number of IOPS that specific VMs can consume.
PDF File: VMware vSAN 6.6 Datasheet