Re: onbar question

Hi, The answer is quite easy, her some explanation: 1. A serial back-up (ontap and onbar -w ..) will start the backup of all dbspaces at the smae time. So the dbspaces are consistent at that time 2. With a parrallel back-up Informix will starts a back-up thread for every dbspace and not all have to be started at the same time. So every dbspace has it's own starting point. So the dbspaces must be synchronized to be consistent. So specific things for a parrallel back-up are: - Every dbspace is handled seperately. - Every dbspace has it's own synchronisation point - Only when a dbspace is really in the back-up process temporary space is required to store before images So advantages are: - parallel backup - less temp dbspace requirements To see the difference in action do: - onbar -b -w - onstat -g arc - onbar -b - onstat -g arc You will see the difference in the output of the two onstat -g arc commands. Look at the timestamps. Hope this helps, Rob Prop "samir BADAOUI" <samir_badaoui@hotmail.com> schreef in bericht news:bbmfvc$8b7$1@terabinaries.xmission.com... > > Hi all, > I just migrate my backup tool from ontape to onbar. With my ontape > configuration I have my LTAPEDEV set to /dev/null. > To have the same thing with onbar I have to use the -w option with onbar, > because the serial backup of dbspaces don't need logical recovery. > My question is why with parallel-backup we need the logical logs and not > with the serial one ?? > > Thanks for any help > > _________________________________________________________________ > MSN 8 with e-mail virus protection service: 2 months FREE* > http://join.msn.com/?page=features/virus >