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Change Journal size best practices... RRS feed

  • Question

  • Hi all;

    As you know, when creating a Protection Group, DPM allocates 300 MB disk space on the Protected Computer for change journaling...

    Now my question is, are there any best practices to allocate space for the purpose of change journaling?

     

    Thanks

     

    • Changed type R.Alikhani Monday, April 11, 2011 3:30 PM
    Monday, April 11, 2011 8:32 AM

Answers

  • The 300MB for USN is good enough almost always, Unless you have millions of files changed per day (or backup interval).

    The USN only stores meta information regarding changes, It doesnt store the actual data contents/blocks,
    and also multiple writes on a file is grouped as a sinle entry.
    i.e, If 100 MB files is written using 100 writes of 1 MB each, then only 1 or 2 entries (of few bytes) are added.

    Thanks,
    Arun.

     

    • Marked as answer by R.Alikhani Monday, April 11, 2011 3:30 PM
    Monday, April 11, 2011 8:59 AM

All replies

  • The 300MB for USN is good enough almost always, Unless you have millions of files changed per day (or backup interval).

    The USN only stores meta information regarding changes, It doesnt store the actual data contents/blocks,
    and also multiple writes on a file is grouped as a sinle entry.
    i.e, If 100 MB files is written using 100 writes of 1 MB each, then only 1 or 2 entries (of few bytes) are added.

    Thanks,
    Arun.

     

    • Marked as answer by R.Alikhani Monday, April 11, 2011 3:30 PM
    Monday, April 11, 2011 8:59 AM
  • Thanks Arun!

     

    Monday, April 11, 2011 3:30 PM