To get multiple SBT channels to work we use the following.... Its works
fine...

RMAN_INCR_BKUP()
{
rman <<EOF
connect target rman/$PASSWD@${SID}
connect catalog rman/$PASSWD@${cat}

configure default device type to sbt;
configure channel device type sbt parms
  'ENV=(NSR_SERVER=NSRSERVER,
  NSR_DATA_VOLUME_POOL=RMANPOOL,
  NSR_DEBUG_FILE=/var/adm/log/NSR_DEBUG.log,
  NSR_CLIENT=ORABOX,
  NSR_SAVESET_RETENTION=15 day)';
configure device type sbt parallelism 6;
configure retention policy to recovery window of 15 days;

run {
backup
  incremental level=${ilev} cumulative filesperset 5
  format '%d_incr_${ilev}_%s:%p:%t'
  database;
backup format '%d_ctl_%s:%p:%t' current controlfile;
sql "alter database backup controlfile to trace";
resync catalog;
}

EOF
} 

The above sets 6 concurrent channels , we have also set others to go
concurrently to multiple pools...

Hope this Helps.

Ian.


Ian Mcleavey

Manager   - Global Enterprise Storage 

*(410)-716-3411 * (410)-716-2656

*(717)-676-0733 *Ian.mcleavey AT bdk DOT com


-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]
On Behalf Of Denis
Sent: Monday, April 10, 2006 9:39 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Parallelism configuration with NMO 4.2

Quoting J Alley <j.b.alley AT LMCO DOT COM>:

> We are running Networker 7.3 on a Solaris 9 server, and we just 
> installed the NMO on a Solaris 9 server running Oracle 9i.
>
> We have the rman backup working just fine to a single tape device.  We

> are trying to make the backup use more than one tape device to improve

> the backup time.  The save group parallelism is set to 0 so that the 
> number of tape devices needed will be determined by the number of save

> streams.  We have tried changing the number of filesperset in the RMAN

> script, and we tried allocating additional channels.  Nothing seems to
be working.
>
> Is anyone else running RMAN backups to multiple tape devices?  If so 
> can you share how you made it work?
>
> Thanks
> J
>
Hello,

Have you checked this option in NMO ? :

NSR_NO_MULTIPLEX is set for a specific RMAN channel, and specifies
whether multiplexing is disabled during a backup on the NetWorker device
that the RMAN channel uses. If multiplexing is disabled, no other save
sets can be written to the device until RMAN channel is finished with
it. NSR_NO_MULTIPLEX should only be used with serial devices such as
tape drive

And you may take a look at this white paper for oracle :

http://otn.oracle.com/deploy/availability/pdf/rman_performance_wp.pdf

Regards

Denis

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