RE: Curiosity question - Bandwidth using RMAN duplicate from Serivce
Date: Fri, 1 Mar 2019 03:54:07 +0000
Message-ID: <DB7PR06MB6053127F1A8412E4665A66B0C6760_at_DB7PR06MB6053.eurprd06.prod.outlook.com>
Mladen,
" One channel on a physical Linux box typically does around 350 GB/hr when compression is used. It's around 7.5 MB/sec. "
Mate, do you mean a single channel is throttled within Oracle itself? Why do we need 10 channels on a 10G net to get 3.5T/hr? Is it documented ?
Thanks,
Yogi | Technical Consultant – Databases | Fidelity International
5th Floor, Building 9, Candor Tech Space,
From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> On Behalf Of Mladen Gogala
Sent: 28 February 2019 07:46
To: oracle-l_at_freelists.org
Subject: Re: Curiosity question - Bandwidth using RMAN duplicate from Serivce
FULL DISCLOSURE: I am an employee of Commvault Systems.
Regards
On 2/27/19 6:34 PM, Chris Taylor wrote:
If you're doing a duplicate from a service_name to a clone, can one channel use all the available bandwidth between the 2 hosts?
I don't know of any reason why a channel itself would be throttled. I can understand a channel not being able to read enough from disk to fill up the network card, so I'm guessing in theory 1 channel could use all the available bandwidth if it was reading from disk fast enough?
Key question:
I wonder how you could determine the correct number of channels if you know your disk read rate to avoid hammering your network bandwidth going out of the server?
(Note: I recently pegged a network card on a production server doing an RMAN duplicate and I've been puzzling over this since then - doesn't help that our production server had one network card only)
Chris
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Mladen Gogala
Database Consultant
Tel: (347) 321-1217
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Received on Fri Mar 01 2019 - 04:54:07 CET