Rick,
  About a year ago we implemented the Data Domain system just as you
described and after having some time to study its operation and design I
would urge you to think long and hard about it and debate the design
with DD and TSM Support. My concern is this, as recommended by Data
Domain we removed all copy pools and replicate a duplicate copy of our
entire primary sequential (file) storage to our DR site. The problem is;
what do you do if you incur corruption or some other issue in the
primary pool that would normally be resolved by marking the volume as
destroyed and recovering the data from the copy pool (which is now
non-existent). While I have not begun the discussion yet I think a
better design approach may be to either use the DDR as a copy pool
resource or incorporate the resources at the DR site to add copy pools.
Think about it in terms of "what if" something happened to the data at
the primary facility and it got replicated to the DR site, what would be
your option to resolve? I don't see any.

Feedback anyone?

~Rick Adamson
Jacksonville, Fl.



-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Richard Rhodes
Sent: Tuesday, March 22, 2011 9:13 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] draining a diskpool when using a DD and no copypool

Hello everyone,

An interesting problem . . . we are implementing a Data Domain system.
It
will be configured as a file device via NFS mount.  DD replication of
the
primary file device pool to the DR site will be use so there will be no
copypool.   We will still use a diskpool with migration into the file
device pool, and this brings up a problem.  The majority of backups come
in over night into diskpool and get migrated.  But some backups (Oracle
archive logs, long running backups from remote sites and some others)
come
in at any time around the clock.  Since DR relies on DD replication of
the
primary file device pool, we MUST make sure that at some point every
file
in diskpool  gets migrated.    With ongoing backups coming into
diskpool,
migration to 0% may never complete.    The one thought we had was to
once
a day (after migration completed) run movedata on each diskpool volume.

We've asked DD this question, but so far they haven't provided an
answer.


Thanks!

Rick


-----------------------------------------
The information contained in this message is intended only for the
personal and confidential use of the recipient(s) named above. If
the reader of this message is not the intended recipient or an
agent responsible for delivering it to the intended recipient, you
are hereby notified that you have received this document in error
and that any review, dissemination, distribution, or copying of
this message is strictly prohibited. If you have received this
communication in error, please notify us immediately, and delete
the original message.