On 19/10/2011 4:18 AM, Prather, Wanda wrote:

Just asking.
As I recall, the announcements for client-side dedup said it is supported by 
the API, so therefore should work with TDP's.
Has anybody achieved (or attempted?) significant improvements in throughput 
with backup of large DB's using client-side dedup?

Wanda Prather  |  Senior Technical Specialist  | wprather AT icfi DOT 
com<mailto:wprather AT icfi DOT com>   |  www.jasi.com<www.jasi.com%20>
ICF Jacob&  Sundstrom  | 401 E. Pratt St, Suite 2214, Baltimore, MD 21202 | 
410.539.1135

Of course Wanda there is a gotcha.  CLIENTDEDUPTXNSIZE server option
restricts the size of the object that can be client deduped, and it is,
at 6.2.3 restricted to 1TiB maximum.  For some DBMS that may not be a
problem, e.g Oracle breaks its backups into backuppieces of a certain
size,   but for a big DB2 database its an issue as that baby comes down
in one transaction.

Its a little disappointing that such limits exist.

Regards

Steve

Steven Harris
TSM Admin
Canberra Australia