Very good redundant VSAN in relatively low price

My company leads business of alarm monitoring center. We need the system with no data loss in case of issues and with no interruption (or only several seconds of interruption) in data processing. We need full redundant environment for my database and for alarm monitoring center programs. A single server is not considerable. Before, we used a cluster of two Windows servers with shared storage system on a single hardware SAN. On this environment was running clustered SQL server with database mirroring. Every part of the system was redundant except for SAN. It was almost satisfying. Every cluster server system we know needs shared storage system. The cluster could be fully redundant, but this redundancy is worth nothing without a redundant storage system. We had a single SAN system. As a single system, SAN was not redundant. But we needed a redundant storage system. We always were afraid that once upon a time our SAN will stop to work. That's why I use StarWind Virtual San.