> Given the same senario, if my storage unit is a DSU, will the small  
> backup job go through as there is no tape drive involved.

If you've got your DSSU setup to accept more than one stream at a  
time, yes.

Before you get too far into design, you should work out how fast the  
backups to disk actually are. This can have a big influence on how you  
use your DSSU. I have a 3TB DSSU, (RAID 6 SATA) and I can't get any  
better than about 50 MB/sec out of it (usually about 30 MB/sec). I can  
get the tape drives up to 150 MB/sec. The majority of people seem to  
think backing up to disk is going to be faster, but that's not  
necessarily the case.

I still direct the majority of backups straight to tape, and use the  
DSSU for the big long slow ones, like the 1.5 TB Windows client which  
can only send data to the NBU server at about 15 MB/sec. I send that  
to disk, so it doesn't hold a tape drive for a day and a half.

I also use the DSSU for the backups which don't really have a large  
amount of data to backup, but need to run and complete fairly quickly,  
like Oracle archive logs.

YMMV.

Cheers,
Dean

On 27/03/2009, at 6:05 PM, dy018 wrote:

>
> Hi,
>
> I'm still in the mist of a backup design to use either a DSU or a  
> DSSU target for my interim backups.
>
> Would like to know if there's a limitation in the number of streams  
> if the storage unit is a DSU? I also assume multiplexing will not be  
> a issue if the target is DSU right?
>
> Another senario is, if i were to use backup direct to tape, i have a  
> backup that require to run the bpstart notify script to do some  
> export dump and it might take 30mins or more, the backup will  
> actually hog the drive during the export dump and if there's another  
> small backup that trigger during that time will be put in queue.
>
> Given the same senario, if my storage unit is a DSU, will the small  
> backup job go through as there is no tape drive involved.
>
> Appreciate anyone of you having such a configuration to share your  
> experiences. Thanks
>
> + 
> ----------------------------------------------------------------------
> |This was sent by dy_lan018 AT yahoo DOT com via Backup Central.
> |Forward SPAM to abuse AT backupcentral DOT com.
> + 
> ----------------------------------------------------------------------
>
>
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu

_______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu