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RMAN, vanilla or "tweaked"

From: Kline.Michael <Michael.Kline_at_SunTrust.com>
Date: 2006-01-12 22:17:04
Message-id: 5709F47931154947BA9DB0C4C39517091870D9@ga016e0m13.corp.suntrust.com


We are trying to squeeze out more performance on RMAN. The network folks said our back channel is only 60% used and NetBackup has found quite a few errors and corrected them.  

What other settings other than more tape drives have you found to be very useful?  

For instance, how many are tweaking the blksize on the allocate channel command and did it really help?  

How many are messing with the backup_tape_io_slaves and what numbers worked and what numbers provided no help at all. I know on some things 4 may be WAY better than zero, but 10 provides maybe 2% more, thus useless.  

Also, what kind of throughput is possible? We are doing about 22 to 30MB per channel thus far. But on one test pushed that to 47MB. How come we can't push 47MB all the time?  

We've got several databases in the multiple TB and at least once a week will need to do a full backup on.  

Where does one look first now that we are getting close to using this for production? In the past "vanilla" has pretty much handled it.  

Thanks.  

Oh yea, I've got Bob's book which I'm devouring... again.  

Michael Kline
Database Administration
SunTrust Banks, Inc.
Mail Code TOC-7505

1030 Wilmer Avenue
Richmond, Va. 23227
Tel: 804.261.9446 Net: 643.9446

Cell: 804.744.1545
michael.kline_at_suntrust.com  

Seeing beyond Money(sm)         

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Seeing Beyond Money is a service mark of SunTrust Banks, Inc. [ST:XCL]               Received on Thu Jan 12 2006 - 22:17:04 CST

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