cloudunanutshell

VMware's vSAN OSA and vSAN ESA Since vSAN original storage architecture (OSA) was launched as a software-defined storage product by VMware, it has always been a two-tier architecture constructed of 1 - 5 disk groups - with each disk group then having one tier of dedicated caching devices, looking after the performance of your cluster, and then your second tier having a layer of dedicated capacity drives.               Figure 1.  vSAN OSA                        With vSphere release 8.0, customers will now have another option during cluster deployment for their 3-node, 2-node and stretched VxRail clusters with VMware’s new vSAN Express Storage Architecture (ESA).  Figure 2. vSAN ESA selection during initial cluster configuration vSAN ESA is a new single-tier architecture where all the drives in your cluster will contribute towards both cache and capacity requirements, with a new log-structured file system that takes advantage of the improved capabilities of modern hardware, driving b