Monday, February 10, 2014


Couple quick points on dedupe:
  1. sis start /vol/volname is a "from this point forward" command.  It does automatically go back to any existing data and dedupe it.
  2. Volume snapmirror is dedupe aware
  3. Qtree snapmirror isn't dedupe aware.  You can enable dedupe independently on the source and destination.
  4. It's good to run sis start -s on older volumes.  Cleans up stale fingerprints, improves efficiency, and does dedupe the existing data in the volume.  If you run this on the source vol that is snapmirrored, it also affects the dest vol.
  5. If you're enabling dedupe on an existing volume, run sis start -s during off hours to tackle existing data.

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