Rdisk protocol overview

To understand the QoS requirements for the product Rdisk protocol, you must understand how it works. The Rdisk protocol defines how the Edge and Cores communicate and how they transfer data blocks over the WAN. Rdisk uses five TCP ports for data transfers and one TCP port for management.

TCP port	Operation	Description
7970	Management	Manages information exchange between Edge and Core. The majority of the data flows from the Core to the Edge.
7950	Read	Transfers data requests for data-blocks absent in Edge from the data center. The majority of the data flows from the Edge to the Core.
7951	Write	Transfers new data created at the Edge to the data center and snapshot operations. The majority of the data flows from the Edge to the Core.
7952	Prefetch0	Prefetches data for which the product has the highest confidence (for example, file Read Ahead). The majority of the data flows from the Core to the Edge.
7953	Prefetch1	Prefetches data for which the product has medium confidence (for example, Boot). The majority of the data flows from the Core to the Edge.
7954	Prefetch2	Prefetches data for which the product has the lowest confidence (for example, Prepop). The majority of the data flows from the Core to the Edge.

TCP port	Operation	Outgoing branch office bandwidth	Outgoing branch office priority	Outgoing data center bandwidth	Outgoing data center priority
7970	Management	Low	Normal	Low	Normal
7950	Read	Low	Business critical	High	Business critical
7951	Write	High (off-peak hours) Low (during peak hours)	Low priority	Low	Normal
7952	Prefetch0	Low	Normal	High	Business critical
7953	Prefetch1	Low	Normal	Medium	Business critical
7954	Prefetch2	Low	Normal	High	Best effort