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Splitting DBs into multiple files for IO spread


Splitting DBs into multiple files for IO spread

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Michael Valentine Jones
Michael Valentine Jones
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There is another possibility: Use the four LUNS to create a single volume on the server for the database datafiles.

The data would be spread across the four LUNS automatically by the OS when you create files there, and there wouldn’t be the problem of trying to figure out where the hot data spots are.
Perry Whittle
Perry Whittle
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Michael Valentine Jones (1/15/2014)
There is another possibility: Use the four LUNS to create a single volume on the server for the database datafiles.

The data would be spread across the four LUNS automatically by the OS when you create files there, and there wouldn’t be the problem of trying to figure out where the hot data spots are.

That's a really bad idea. To do this requires creating dynamic volumes in windows and then striping a volume across the 4 disks. You're creating a software RAID across LUNS that are already presented from a hardware array (s). The big problem which no one seems to be grasping is that if all the LUNS don't have the same response time you'll get I\O slowdown as the others will have to wait!
Keep it simple!

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"Ya can't make an omelette without breaking just a few eggs" ;-)
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