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

Make sure that you are actually writing to all three tape devices. It might be that you are restricted to a single device.

RF

• Janardhana Babu Donga <jbdonga_at_ucdavis.edu> wrote:
  > Dennis,
  >
  > Thanks for your reply. Iam taking tape backup with 3
  > channels as we have
  > multiple tape drives. I don't know where the
  > bottleneck is. In the RMAN
  > output I see it is using all the three channels
  > simultaneously with 10
  > datafiles per channel. But Iam not getting the
  > throuput. It is taking the
  > same amount of time as it used to take for single
  > channel. I don't know
  > where to look, and don't know how to fix the problem
  > and take advantage of
  > multiple channels.
  >
  > -- Babu
  >
  > -----Original Message-----
  > Sent: Thursday, February 20, 2003 9:39 AM
  > To: Multiple recipients of list ORACLE-L
  >
  >
  > 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
  > --
  > Please see the official ORACLE-L FAQ:
  > http://www.orafaq.net
  > --
  > Author: Janardhana Babu Donga
  > INET: jbdonga_at_ucdavis.edu
  >
  > Fat City Network Services -- 858-538-5051
  > http://www.fatcity.com
  > San Diego, California -- Mailing list and web
  > hosting services
  >
  

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  > Author: Janardhana Babu Donga
  > INET: jbdonga_at_ucdavis.edu
  >
  > Fat City Network Services -- 858-538-5051
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  > hosting services
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