RE: Q. To RAC or go vertical

The 15k was simply a node in a cluster.

Jared

tjambu_fatcity_at_yahoo.com.au
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 08/05/2003 10:24 AM
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        Subject:        RE: Q.  To RAC or go vertical

Hi Jared

Was that a cluster of Sun E15ks or A single E15K of clustered domains within itself?

The reason I mention the E12k and HP Superdome was that the equipment is already available. All I need is to purchase additional CPUS.

I am trying to enquire as to what people have commissioned with 10TB database using RAC vs single large boxes. If you read some of the postings about RAC on Solaris, there are lots of issues with it. How true one of these that said that you do not get the scalability after 2 nodes and on the 4th node it degrades to about below 50%.
This is specifically on Solaris.

ta
tony

At 07:44 AM 05/08/2003 -0800, you wrote:

>While fault tolerance is certainly one of the features of RAC,
>it isn't correct to say that it is not also for scalability.
>
>Buy a bigger box? That works fine until you're in the biggest
>box you can get, then what? I realize that it's a small market
>segment that requires that kind of hardware, but it still exists.
>
>Sun has been testing a cluster of 15k servers with RAC, ostensibly
>for scalability. Some nodes are populated with 78 CPU's and 288
>Gig of RAM. ( yes, that is correct ).
>
>Jared
>
>
>On Tue, 2003-08-05 at 07:54, Stephen Lee wrote:
>>
>> I think the point of RAC is fault tolerance, not scalability. If it's
>> performance you want then you want a bigger box, not more boxes. 8
CPUs is
>> not big. You sure don't need the expensive hardware if all you want to
run
>> is 8 CPUs. It would be better to go with a smaller frame and use the
money
>> you save to get more CPUs and additional I/O capacity. For example,
instead
>> of E12K with 8 CPUs, get 4810 with 12 CPUs -- unless you have definite
plans
>> to push the E12K out to its limits in the future. Don't forget to
consider
>> the backup requirements of a 5 - 10 TByte database. Another
consideration,
>> I think, is that those big, fancy boxes require additional sys admin
skills.
>>
>> -----Original Message-----
>> Hi All
>>
>> I would like to ask for your thoughts on whether to RAC or just go
vertical
>> (more cpu)
>>
>> Background
>>
>> Txn - OLTP like txn during day but batch extracts at night and
>> very big batch extract periodically
>> Data Volume - 5-10 TByte
>> Data volatility - 99 % of data is very much like a ware house
(unchanged)
>> other 1% is read/update/delete/insert
>>
>> Options
>> 1. Say a very large server like a HP Superdome or SUN E12000
>> with 8 CPUs
>> Server already exist so cost is in obtaining additional
CPU/Blades
>> ie Traditional Server using plain old vanilla Oracle EE
>> - can still increase head room.
>> - batch programs can utilise all 8 CPUs
>> - storage system need not cater for clustering
>>
>> 2, Same large server like a HP Superdome or SUN E12000 but partitioned
>> into two. Each with 4 CPU.
>> Oracle RDBMS + RAC option
>> - storage server need to cater for cluster config
>> - max performance for batch is with 4 CPUs only
>>
>>
>> Which would you prefer and why. I am not convinced with the RAC
option.
>> Now
>> if I was going with cheaper Intel servers like Dell servers with 4 CPUS
>> each, and
>> purchase say 4 nodes of 4 cpus each, that would be a different story.
In
>> this case
>> I have the equipment and ability to grow vertically.
>>
>> ta
>> tony
>> --
>> Please see the official ORACLE-L FAQ: http://www.orafaq.net
>> --
>> Author: Stephen Lee
>> INET: Stephen.Lee_at_DTAG.Com
>>
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>
>
>--
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>Author: Jared Still
> INET: jkstill_at_cybcon.com
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