Meta server: finish first round of meta server's side of partial chunk inventory synchronization logic. Implement hello resume response, core logic of partial chunk inventory synchronization, and re-hibernate / resume restart in the case if chunk server connection breaks or chunk server goes down during processing chunk server hello resume. Hello response tells chunk server the meta server's view of chunk server's chunk inventory via chunk count, and chunk inventory checksum, list of deleted, and possibly modified chunk ids since the time the chunk server disconnect was detected by the meta server. The chunk server removes deleted chunks, and then re-computes chunk inventory checksum by adding chunk ids of the modified chunks that do not exist in chunk server inventory, if any, and compares chunk count and chunk inventory checksum, and if these match, continues partial chunk inventory synchronization by sending list of possibly modified chunks and list of all non stable chunks, otherwise chunk server performs full chunk inventory synchronization. The chunks that were possibly modified (by changing chunk version) between the initial hello reply and hello resume request (partial inventory sync) chunk version change RPC is submitted to chunk server with the "from" version equal to "to" version and "do not make stable" flag set (effectively no-op), in order to verify chunk replica version, the chunk replicas will be "added back" only if chunk server's replica version matches the meta server's version.