Just to clarify, Journal Based Backup only backs up objects which have
changed based on solely on the
contents of the change journal maintained by the journal service.

The change journal is maintained based on change notifications reported by
the filesystem.

Traditional incremental backup must build the entire list of objects for
the local file system
and the entire list of objects stored on the  server file space for that
file system and compare
the two lists to derive a list of backup candidates.

Note that the above is done regardless of how many objects are actually
backed up, if only one object
changes both lists must still be built and processed.


Pete Tanenhaus
Tivoli Storage Solutions Software Development
email: tanenhau AT us.ibm DOT com
tieline: 320.8778, external: 607.754.4213

"Those who refuse to challenge authority are condemned to conform to it"

---------------------- Forwarded by Pete Tanenhaus/San Jose/IBM on
10/29/2002 10:18 AM ---------------------------

Andrew Raibeck/Tucson/IBM@IBMUS AT VM.MARIST DOT EDU> on 10/29/2002 09:36:12 AM

Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>

Sent by:    "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>


To:    ADSM-L AT VM.MARIST DOT EDU
cc:
Subject:    Re: Journaling



Turning on journaling does not require backing up all files (unless they
have all changed).

Regards,

Andy

Andy Raibeck
IBM Software Group
Tivoli Storage Manager Client Development
Internal Notes e-mail: Andrew Raibeck/Tucson/IBM@IBMUS
Internet e-mail: storman AT us.eyebm DOT com (change eye to i to reply)

The only dumb question is the one that goes unasked.
The command line is your friend.
"Good enough" is the enemy of excellence.




"Gill, Geoffrey L." <GEOFFREY.L.GILL AT SAIC DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
10/29/2002 07:23
Please respond to "ADSM: Dist Stor Manager"


        To:     ADSM-L AT VM.MARIST DOT EDU
        cc:
        Subject:        Journaling



Why, after turning on Journaling, is TSM now going to back up the whole
600GB "AGAIN"!

Geoff Gill
TSM Administrator
NT Systems Support Engineer
SAIC
E-Mail:    <mailto:gillg AT saic DOT com> gillg AT saic DOT com
Phone:  (858) 826-4062
 Pager:   (877) 905-7154