Just be sure and post it to the list. There are folks here
with more NBU/RMAN experience than I.
Network between database server, master server and media server.
10Megabit, 100 Megabit, Gigabit?
Concurrent backup jobs?
# of Tape drives dedicated to this backup?
Type of drive? LTO, DLT, Super DLT?
This question is better phrased as:
"What is the streaming capacity of the drives involved in the backup?"
There are more questions, but this is a start.
Jared
Janardhana Babu Donga <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
02/20/2003 02:13 PM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: 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 <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
02/20/2003 10:47 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L
<[EMAIL PROTECTED]>
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.
-- 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.
[EMAIL PROTECTED]
-----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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