Hello,
Currently we are using TSM 6.1 to do NDMP backups of our EMC Celerra.
We are getting no de-duplication results from these backups.  I'm
wondering if it is because the celerra is already sending a compressed
image snapshot file to TSM and TSM just doesn't de-dupe a file like
that.  We're thinking about going to a more traditional backup method
for NDMP backups (going with weekly incrementally, and monthly
fulls...etc) however it would be good to understand why this is
happening.  I find it a bit strange because we still do file-level
restores just fine...

If someone could educate me a bit more that would be great for piece
of mind!

Thanks!
Brian P. Boyd
Sr. SAN Admin
DUKE - OIT
boydbria (at) duke (dot) edu