fredag 16 mars 2012

The size of the blocks

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.

4 kommentarer:

  1. Hi Robert,
    i am Little bit confused, whats the different between thees two?
    256KB from Agent to Server to disk´
    64KB from Server to Disk?

    1. Hi Michael,

      256KB is the size the DPM agent transferes from the protected server to the DPM server.

  2. Hi Robert
    Is there any way of changing block size written to disk by DPM 2010? Or 2012 for that matter?
    Thanks Mårten

  3. Hi Mårten,

    No this is in the code