Primary App Server what is it and what is difference between PAS and dialog

[Former Member]

I have noticed that SAP makes reference to a Primary Application Server Instance (DB instance is clear

and so in the Central Services instances and dialogue instance...However what is not clear is what is the Primary App Server Instance?

hanks

Mikie

[Former Member · Accepted solution]

Primary Application Server Instance is you old CI and Additional Application Server instance is your old DI.

So now you have if you are doing a HA install

1) ASCS ( Depending on single or dual stack)

2) SCS ( Depending on single or dual stack)

3) Database Instance

4) Enqueue Replication server instance ( As part of 7.1)

5) Primary Application server instance

6) Additional Application server instance

Hope this helps.

Thanks,

Naveed

[Former Member]

I thought the Central Services Instance was different from PAS? Do you have any SAP documents that explains this?

Thanks

Mikie

[Former Member]

Hi,

The previous Central Instance is broken down in ASCS and PAS.

With this setup the fail over can be faster on a HA cluster. It makes also possible to use the replicating Enqueue server.

Regards,

Olivier