Multiplexing will not magically increase the capacity of your tapes........

Typically the backup data streaming from your netbackup client will not be 
arriving at the server any where near the speed that your tape drive can 
write data to the tape.

Multiplexing allows netbackup to write two (or more) backup streams to the 
same tape drive at the same time, thereby increasing the thruput to the tape

drive, and decreasing the elapsed times of your backups.

HTH,

Brian Briscoe
European OA Support,
Visteon UK Ltd,
Visteon Technical Centre, 28/803,
Dunton, England,
Tel  (8738)6214 Ext 01268 406214
Fax (8738)4367 Ext 01268 404367
Email: bbriscoe AT visteon DOT com

 

> -----Original Message-----
> From: WEAVER, Simon [mailto:Simon.WEAVER AT astrium-space DOT com]
> Sent: 20 May 2002 13:45
> To: 'veritas-bu AT mailman.eng.auburn DOT edu'
> Subject: [Veritas-bu] Multiplexing
> 
> 
> Firstly, Thank you all for your help with BPEXPDATE. I am 
> glad I am getting
> this right now :)
> 
> I have one small question about Multiplexing. On the 
> Netbackup PDF's (which
> is what I am using) it says you can specify the number of 
> jobs that can
> multiplex to a single tape drive! (Words to that effect).
> 
> My question is this: I have a backup policy with 8 clients 
> listed. Within
> this backup policy I have specified to backup All Local 
> Drives for these 8
> clients. I want to use as less tapes as possible (I use 100GB 
> HCART Tapes).
> If I increase this Multiplexing number, does it mean that 
> more data will be
> written to a single drive in a tape?
> 
> We use an ADIC Scalar 100 which consists of 3 tape drives. 
> Because I have no
> more slots available to place blank tapes, I was kind of 
> hoping that using
> this Multiplexing option will help retain more data on a single tape!
> 
> Am I right, or am I reading this incorrectly.!
> 
> Thank you
> 
> Simon Weaver
> NT Domain Administrator
> Ext. 5544
> Tel: 02392-705544 (Direct Dial)
> Simon.Weaver AT Astrium-Space DOT com
> 
> ...
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> Nothing in this email shall bind Astrium Limited in any 
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> Stevenage
> Hertfordshire
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