During the past days I have been investigating the size of the blocks of data that is transmitted from the production server via the DPM agent to the DPM server.
This is interesting in many ways but mostly is due to storage. This size will be the size written to the DPM disk pool, this means that you can optimize your storage. The block size the DPM agent sends to the DPM server is 256KB.
Another part that also is important is how the actual write process from the DPM server to the disk pool. There are many different techniques but the most common is small(8k) or large (64k) sequencally I/O? DPM will write the data to the disk pool with a large 64 sequencally data.