RE: RMAN backup with MULTIPLE CHANNELS ......

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Thu, 20 Feb 2003 09:38:57 -0800
Message-ID: <F001.005531C4.20030220093857@fatcity.com>

Babu - We allocated multiple channels on an RMAN disk backup and the backup time was reduced. I would suggest you try to figure out where your bottleneck is. Are you writing to multiple tapes? Actually, RMAN has several features to keep the tape streaming, you may want to look at these. If your tape isn't streaming, you might get more throughput from a single tape drive than you are now.

Dennis Williams
DBA, 40%OCP, 100% DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Thursday, February 20, 2003 10:44 AM To: Multiple recipients of list ORACLE-L

Dear List,

I have changed my RMAN backup script to use multiple channels(3) as we have plenty of tape drives. It is taking the same amount of time as it used to with single channel. The DB size is 120gig. The output indicates it is using three channels while backing up. Anyone has any idea why the multiple channels not reduced the backup time. Iam using Veritas Netbackup. Thanks in advance for any help.

• Babu
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  Author: Janardhana Babu Donga INET: jbdonga_at_ucdavis.edu

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Author: DENNIS WILLIAMS
  INET: DWILLIAMS_at_LIFETOUCH.COM

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