i have used P89V51RD2 microcontrollers…and nearly 5 micro controllers have been used. and ya pal soon i will share it, once i had done preparng report on it.
but as understanding, we have developed and controller node,2 storage severs(like virtual servers) same as used for cloud storage sytem and RS 485 bus has been used to communicate and also an master user has been developed who can see the stored data from different hard ware systems
but its an limited memory application.