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Home -> Community -> Mailing Lists -> Oracle-L -> RE: RMAN backup with MULTIPLE CHANNELS ......
Look for something like channels-per-tapedrive on the backup server configuration. You have to be above this figure to use multiple tape drives.
>>> jbdonga_at_ucdavis.edu 02/21/03 07:47a.m. >>> 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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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 - 16:13:53 CST
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