Netbackup DLT Tape Drive

[cavie]

Hi,

I am currently testing Netbackup DataCentre 4.5a on Solaris 8 with a DLT Tape Library with 3 DLT Tape Drives. This Sun Master/Media server had a Gigabit interface. The clients are various Sun Servers on different network.

I noticed that the tape backup speed varies at unpredictable rate. At times, I seeing thruput of 4-5Mbs, but on the other, I am seeing only 345kbs.

One scenario goes like that

Client A backup on tape drive 1 at 4Mbs.
Client B backup on tape drive 2 at 3Mbs.
Client C backup on tape drive 3 at 675kbs.

Even when Client A and B finished its backup, Client C still continue at 675kbs. Client C network is not slow because I have previous trials when its backup is consistently at 5Mbs. My question is whether there is a way to maximise the thruput of tape drive under Netbackup? Netbackup does not seems to be able to dynamically optimise its tape drive/network thruput.


Thanks and regards
cavie

 

[PGPhantom]

Check out faq776-3124 for an explanation of buffers etc and change accordingly.

 

[falcetta]

Set up the policy to do multi threading and multi streaming

Rick