I am planning to setup an SQL server on a four-node SAN cluster. I am being offered Fibre hubs and Fibre Switches. What do you recommend? What are the pros/cons of each?
My recommendation would be to skip the hubs, and go with the switches for your four-node cluster. The reason being is that while hubs may be cheaper than switches, you also get what you pay for. Given that you are clustering your services, I presume for high availability, why take any chances on hubs with shared bandwidth and shared loop access? Switches have the ability to support loop devices -- for example, an older tape drive, should you have the need. With a hub all ports share the common bandwidth of the hub, which could impact your performance. Beyond performance, switches also have the advantage of providing better isolation of ports and subsequently various devices. Since you are clustering, I would also recommend implementing a pair of switches to create to separate paths to your storage for redundancy. The price of Fibre Channel switches and adapters continue to decrease in price, which makes redundant paths more affordable.
Dig Deeper on SAN technology and arrays
Service provider outages should be a warning to customers that keeping data safe in the cloud is a shared responsibility.
When cloud durability is added to the mix, cloud providers are able to tout a high number of nines of availability.
Cloud storage can be less expensive from a cost-per-gigabyte perspective, but it's important not to lose sight of other benefits as a value ...