Fibre Channel SANs (storage area networks) are touted as more secure than IP-based storage networks. In a way, that is true because Fibre Channel is a distinct network separated from the mainstream client-based applications. Moreover, the Fibre Channel protocol is entirely different from IP, and the deep understanding of the protocol, its implementations are exclusive to a selected cohort of practitioners and professionals in the storage technology industry.
The data landscape has changed significantly compared to the days where FC SANs were dominating the enterprise. The era was the mid 90s and early 2000s. EMC® was king; IBM® Shark was a top-tier predator; NetApp® was just getting over its WAFL™ NAS overdose to jump into Fibre Channel. There were other fishes in the Fibre Channel sea.
But the sands of storage networking have been shifting. Today, data is at the center of the universe. Data is the prized possession of every organization, and has also become the most coveted prize for data thieves, threat actors and other malefactors in the digital world. The Fibre Channel protocol has been changing too, under its revised specifications and implementations through its newer iterations in the past decade. This change in advancement of Fibre Channel as a storage networking protocol is less often mentioned, but nevertheless vital in the shift of the Fibre Channel SANs into a Zero Trust world.
Zones, masks and maps
Many storage practitioners are familiar with the type of security measures employed by Fibre Channel in the yesteryears. And this still rings true in many of the FC SANs that we know of today. For specific devices to connect to each other, from hosts to the storage LUNs (logical unit numbers), FC zoning must be configured. This could be hard zoning or soft zoning, where the concept involves segmentation and the grouping of configured FC ports of both the ends to “see” each other and to communicate, facilitated by the FC switches. These ports are either the initiators or the storage target, each with its own unique WWN (World Wide Name).
On top of zoning, storage practitioners also configure LUN masking at the host side, where only certain assigned LUNs from the storage array is “exposed” to the specific host initiators. In conjunction, at the storage array side, the LUNs are also associated to only a group of host initiators that are allowed to connect to the selected LUNs. This is the LUN mapping part.