Pure Storage, Inc.
Providing an active/active front end by coupled controllers in a storage system

Abstract:

Emulating a remote direct memory access (`RDMA`) link between controllers in a storage array, including: inserting, into a buffer utilized by a direct memory access (`DMA`) engine of a first storage array controller, a data transfer descriptor describing data stored in memory of the first storage array controller and a location to write the data to memory of the second storage array controller; retrieving, in dependence upon the data transfer descriptor, the data stored in memory of the first storage array controller; and writing the data into the memory of the second storage array controller in dependence upon the data transfer descriptor.