Veritas-bu

[Veritas-bu] [Veritas-bu]NBU V3.4 with Oracle 8i Rman backups running at half speed

2001-04-18 17:41:22
Subject: [Veritas-bu] [Veritas-bu]NBU V3.4 with Oracle 8i Rman backups running at half speed
From: bbakh AT veritas DOT com (Bob Bakh)
Date: Wed, 18 Apr 2001 14:41:22 -0700
The other thing to thin about is that RMAN uses SGA to Shared memory to
create the data streams, sometimes a system is tuned for Oracle and leaves
no overhead in the memory for anything else, check out your iostat or
vmstat, look for high scan rates, and monitor CPU and disk usage, you may be
running a hot backup on the database when it's doing a load, and that will
slow things down a bit,

Thanks,

Bob


-----Original Message-----
From: bryan_bahnmiller AT agilent DOT com [mailto:bryan_bahnmiller AT agilent 
DOT com]
Sent: Monday, April 16, 2001 10:35 AM
To: akratunis AT tiaa-cref DOT org; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] [Veritas-bu]NBU V3.4 with Oracle 8i Rman
backups running at half speed


Anthony,

  Remember that the Oracle engine has to pull the data out of the database
and RMAN forms it into a datastream to send to Veritas. (DBA's may correct
me on this.)

  Does the database server have enough cpu to do this? Or, more likely, does
the database server have enough disk I/O to pull the Oracle data off the
disk?

  There may also be some tuning you can do for Oracle too, but generally, if
you have hardware bottlenecks (cpu and/or I/O) they tend to be orders of
magnitude greater than what tuning can provide.

  I would first check your DB server cpu and I/O during a backup.

     Bryan


Bryan Bahnmiller
Agilent Technologies
 

> I have 
> Veritas Netbackup V3.4GA
> Compaq Unix V5.1 & V4.0f
> Oracle V8.0.7
> 
> When I use nbu to backup a flat file system, the backup runs 
> at the speed of
> the tape drive, but when I run the oracle rman backup, the 
> backup runs at
> about half the tape speed.
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