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Home -> Community -> Mailing Lists -> Oracle-L -> RE: RMAN backup with MULTIPLE CHANNELS ......
Jared,
Please let me know what info you need. I would collect it from my Netbackup administrator and let you know.
Thanks,
-- Babu
-----Original Message-----
Sent: Thursday, February 20, 2003 1:02 PM
To: Multiple recipients of list ORACLE-L
One possibility is that the backup job is already maxing out the network connection between the client system and the Veritas NetBackup master server and/or media server.
If you have a 10megabit network and LTO drives, the network will never be able to keep the tapes streaming. Adding 3 channels won't help if your network can't keep up.
I'm speculating here, as you don't really supply enough info about your environment.
Jared
Janardhana Babu Donga <jbdonga_at_ucdavis.edu>
Sent by: root_at_fatcity.com
02/20/2003 10:47 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
cc:
Subject: RE: RMAN backup with MULTIPLE CHANNELS ......
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.
-----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.
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Author:
INET: Jared.Still_at_radisys.com
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Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services ---------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Thu Feb 20 2003 - 16:13:54 CST
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