Hi all,

During ongoing performance investigations I'm coming to the conclusion that
in our environment single-streaming with multiplexing gives us better
performance than multi-streaming with multiplexing.  The individual client
backups may take longer but the overall usage of the tape drives is better.

Two reasons for this :
1. Most of the clients are on 100/mb interfaces & aren't able to supply
multiple streams fast enough concurrently.
2. When multiple streams are multiplexed, typically multiple streams from
the same client go to the same tape drive, so a slow client will really drag
the tape drive throughput down.

My question is, whether I can set NetBackup up so that with multiplexing at
the storage unit and schedule level, and multiple streams from each client,
only one stream from any one client will go to any one tape drive?  i.e. one
stream per client per drive, but multiple streams possible from one client
across the robot.  I think this would be an optimal compromise but don't at
present think it can be done.

Not sure if I've explained this very well...!?

regards, Phil

Phil Weber
Egg UNIX Technologist
Phone: 01384 26 4136
Mobile: 


This private and confidential e-mail has been sent to you by Egg.
The Egg group of companies includes Egg Banking plc
(registered no. 2999842), Egg Financial Products Ltd (registered
no. 3319027) and Egg Investments Ltd (registered no. 3403963) which
is authorised and regulated by the Financial Services Authority. Egg
Investments Ltd. is entered in the FSA register under number 190518. 

Registered in England and Wales. Registered offices: 1 Waterhouse
Square, 138-142 Holborn, London EC1N 2NA.

If you are not the intended recipient of this e-mail and have received
it in error, please notify the sender by replying with 'received in
error' as the subject and then delete it from your mailbox.