Re: Advice needed on move to Sun 15K (losing spindles)

Ask the Sun guys if they will sign a document saying they will pay all cost including hardware to fix the performance problems, if after you make the change and performance is worse. It will show that you are serious and if they seriously believe they are right then they have nothing to fear,

I never understand why these vendors insist in building systems with so little hardware

Cheers

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Anjo Kolk <anjo_at_oraperf.com>
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10-10-2002 05:43 AM
Please respond to ORACLE-L

 
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        Subject:        Re: Advice needed on move to Sun 15K (losing spindles)


Jay,

You will hit performance problems because of not having I/O bandwidth. 
Databases don't need storage, they need IO operations. Two important
pieces of info that are missing from your post:

 - How many databases in total are going to run on this Sun 15K ?
 - How many concurrent users on all databases at the same time ?

Anjo.


"Miller, Jay" wrote:


> 

>  Our  CIO  has  suggested that we get a Sun 15K to house all of our

> databases.  This has some advantages (communication between the various

> boxes would be much faster) but I have some performance concerns.

> 

> Specifically, our main OLTP database would go down from 18 spindles to 8

> spindles.  Mirroring will take away 4 of those leaving 4 spindles.  The

> vendor (Sun) was recommending striping across all 4 spindles. He said we

> don't need to worry about i/o issues because there will be a large 

cache.


> 

> I'm skeptical and argued for cutting them in half (striping 2 and 2). We

> could then at least seperate the redo logs from the datafiles (probably

> putting them with the oracle executables and some other files).

> 

> The Sun rep kept talking up how much more powerful the CPUs were and I 

kept


> saying, "but we're not CPU bound, we don't need any more CPU".

> 

> If anyone can either

> 

> a) tell me I'm worrying for nothing

> b) recommend a better way to stripe/distribute my files

> c) provide references  or experience to show this is a bad idea

> 

> I'd really appreciate it.

> 

> 

> Thanks,

> Jay Miller

> 

> 

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