It's going via TCP/IP and we created separate storage pools for NDMP
backups.

It looks like our other TSM admin turned dedupe off for that disk
pool...so...  either he did it because he wasn't seeing any
deduplication ratios...or?

I'll follow up with him and see why he turned it off.

Can you see any other reason why NDMP backups _wouldn't_ de-dupe?

Thanks!
Brian

On Dec 3, 2009, at 12:00 PM, Wanda Prather wrote:

Is the NDMP backup going via TCP/IP and into the same storage pool
as your
other backup data?
How can you tell it is not getting deduped?


On Thu, Dec 3, 2009 at 11:54 AM, Brian P. Boyd <boydbria AT duke DOT edu>
wrote:

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