It's the same.

NetBackup is not *multithreaded*.  That means that a single process
(process, not program) will only use one CPU at any instant.

NetBackup uses multiple *processes* and therefore will take advantage
of multiple CPUs if there is more than one process which is CPU
constrained.  

The original thread questioned how many CPUs would be needed to drive
240MB/s worth of (potentially) 60MB/s drives.  To do this he would
need at least four bptm processes (one per drive) plus another at
least four bptm to handle the incoming data for the above (probably
more as mpx'ing is probable), plus probably a considerable amount of
CPU handling interrupts and actually moving the data around.  I can't
say how many CPUs would be optimal, but NBU will definitely be using
more than one at a time.


> Hmm.. was he perhaps referring only to Windows?   On Unix/Linux systems it
> is by nature multi CPU aware as it consists of many processes.   (i.e. many
> bptm's during a busy backup period)   The kernel will schedule these
> multiple process across all CPUs.
> 
> -Jon
> 
> ----- Original Message ----- 
> From: "Oleg Ivanov" <o.ivanov AT verizon DOT net>
> To: "Fabbro, Andrew P" <Fabbro.Andrew AT cnf DOT com>; <jmaley AT macromedia 
> DOT com>;
> "Moses, Darby" <DMoses AT leviton DOT com>
> Cc: "Veritas-BU" <veritas-bu AT mailman.eng.auburn DOT edu>
> Sent: Wednesday, September 10, 2003 7:40 PM
> Subject: Re: [Veritas-bu] Driving LTO-2 Drives From Windows
> 
> 
> > I had similar situation and got nice quad cpu box and was killed by
> netbackup engineer with " breaking news" that NETBACKUP 4.5 IS NOT MULTI CPU
> AWARE application, it will NOT use more then one CPU during backups. May be
> veritas will fix that in V 5.0. so don't waste money, just get as much
> single cpu "horse power" as you can, tune up HBA's on host computers and you
> should be flying.
> > However, multi cpu can help if you would use storage/disk backup option in
> netbackup.
> > Good luck!
> > From: "Fabbro, Andrew P" <Fabbro.Andrew AT cnf DOT com>
> > Date: 2003/09/10 Wed PM 03:52:10 EDT
> > To: "'jmaley AT macromedia DOT com'" <jmaley AT macromedia DOT com>,
> >    "Moses, Darby" <DMoses AT leviton DOT com>
> > CC: Veritas-BU <veritas-bu AT mailman.eng.auburn DOT edu>
> > Subject: [Veritas-bu] Driving LTO-2 Drives From Windows
> >
> > We may have an environment where we'll be deploying LTO Gen-2 drives
> > attached to a Windows media server.  The data will be coming in over
2Gbps
> > SAN and I'm guessing 60MB/sec to write it out per drive (based on
30MB/sec
> > we get with Gen-1).  We're 2GBps at all points so there shouldn't be any
> > problems there...
> >
> > ...but I'm wondering what size Windows box I'll need to drive 240MB/sec?
Is
> > a 4-way enough?  8-way?  Anyone doing something like this?

-- 
Larry Kingery 
        An error?  Impossible!  My modem is error correcting.