A method includes registering, by a first computing device, with a distributed storage network (DSN) to indicate that a first storage site is connected via a common local area network with the first computing device and is the primary storage site for the first computing device. The method continues with the first computing device to store a write threshold number of encoded data slices (EDSs) to the first storage site, obtaining a first writing pattern for writing the write threshold number of EDSs to the first plurality of storage units, and transmitting at least a portion of a remaining number of EDSs to one or more storage units at a second storage site, where the remaining number of EDSs are EDSs not included in the write threshold number of EDSs and the second storage site and the first storage site are each one of a sharing group of storage sites.