Server shared container on MPP

dsdoubt · Post by **dsdoubt** » Sat Feb 17, 2007 2:04 am

Hi,
May I know why not to use Server shared container on MPP environment. Won't Datastage have a common repository accross all the CPUs?

chulett · Post by **chulett** » Sat Feb 17, 2007 8:19 am

I would assume because they just don't work.

From the docs:

You can only use Server Shared Containers in this way on SMP systems (not MPP or cluster systems).

Others may know the gory details of the 'why'. [shrug] Or ask IBM.

DSguru2B · Post by **DSguru2B** » Sat Feb 17, 2007 10:30 am

I think, the reason lies in the very architecture of the two systems and the nature of a shared container. SMP uses a single shared memory irrespective of how many cpus are connected to it. The result of the shared container resides in the shared memory and whatever cpu requires the shared contrainer, requests for it.
Where as MPP's are, briefly, many computers hooked up for a massive single unit. It might not be able to work in the same way as the shared container was originally designed to work in and hence the limitation.

I might be wrong, but need someone to confirm it.

dsdoubt · Post by **dsdoubt** » Sat Feb 17, 2007 10:36 pm

But in one of a previous post, Michael has posted that its working in MPP as well.
Just curious to know, will datastage store its repository in each CPU or a common repository will be maintained.

DSguru2B · Post by **DSguru2B** » Sat Feb 17, 2007 11:28 pm

Can you post the link to Micheal's post?
The manual says pretty clearly that it wont work, or atleast not supported. I wouldnt go for something that might break some day.

dsdoubt · Post by **dsdoubt** » Sun Feb 18, 2007 12:36 am

Here it is. Though he haven't given any strong asertion about that, it seems it working.
viewtopic.php?t=85355&highlight=mpp+shared+container

Even you can find Ray is pointing to his post in this.
viewtopic.php?t=85353&highlight=mpp+shared+container

DSguru2B · Post by **DSguru2B** » Sun Feb 18, 2007 1:42 am

Go for it then. As I said before, I wouldnt go for something thats a trial, or might break someday. If it does, you cannot even go back to IBM, as they will point out to the same line that Craig quoted, that it is not supported.

dsdoubt · Post by **dsdoubt** » Sun Feb 18, 2007 1:51 am

I am not going to run it anyways, I just want to know why its recomended in such way. And like to know the architecture of Datastage on MPP.