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тАО04-17-2003 05:43 AM
тАО04-17-2003 05:43 AM
Oracle Logs in VA7400
Currently we have our Oracle data on 1 controller and the indexes on another controller. The log files are primarily on the controller the Oracle data resides.
Does anyone have any suggestions on arrange the logs in the array to get the best performance?
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тАО04-21-2003 09:35 AM
тАО04-21-2003 09:35 AM
Re: Oracle Logs in VA7400
I'm attaching a background sar script that you can configure to measure and collect data over time. It is production in my shop.
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тАО04-21-2003 10:45 AM
тАО04-21-2003 10:45 AM
Re: Oracle Logs in VA7400
If configuration and VA data allocation are optimized, then if you have 3-5 LUNs I do not think system will be able to load VA badly. Too small access concurrency. Of course load balancing LUNs between controllers is good idea, but I think it's significant when there're 5+ LUNs are accessed simultaneously.
And in addition, as we're talking about LUN 'balancing' between VA controllers, this balancing should be planned at the LUN creation stage (and even at VA installattion stage). Why? Because for all LUNs created within redundancy group 1 (RG1, odd slots) perfomance path is VA controller 1 (C1), but for LUNs within RG2 (even slots) is C2.
And finally, 'sar' is command to measure disk perfomance from host's 'point of view', I would also use 'armperf' command to measure perfomance from VA's 'point of view'. Output of this command can be easily imported into excel spreadsheet
Eugeny
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тАО04-21-2003 11:22 AM
тАО04-21-2003 11:22 AM
Re: Oracle Logs in VA7400
1. Data tables.
2. Data indices.
3. Redo logs
4. Archive logs.
Every time you update a row, you write redo log entries. Every so often the redo logs are copied to the archive logs. The redo logs and archive are much smaller than the data files.
So, really you have 4 streams to balance. If you had 4 controllers, that would be good. But if you only have 2 controllers, you will have to balance 4 streams across 2 controllers.
You might want to put the archive logs on the data path, and the redo logs on the index path. Or switch them around.
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тАО04-21-2003 12:06 PM
тАО04-21-2003 12:06 PM
Re: Oracle Logs in VA7400
The separation of indices and datafiles helps, but check ot see how quickly you are writing out log files. If you are transaction based, you may want to kick off multiple logwriters. And as the load reducces let them expire.
Tim
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тАО04-21-2003 12:08 PM
тАО04-21-2003 12:08 PM
Re: Oracle Logs in VA7400
I want you to know that I have seen several logwriters improve performance by better than 50% in transaction based services.
Tim