High Availability

[Former Member]

Hello All

We have to implement add-ins (Java + Abap) WAS installation for XI.

By definition this installation should be High Availability which means that the system should be on the air 24/7.

We have two strong servers for this goal. The ideal configuration for us is that both servers accepts always request but in case of crisis if one of them get down the other one continue from the point that the other one failed. if this configuration isn't possible then other option is that in concurrent time one of the servers will be up and in if it fail the other server raise up and continue from the point that the other failed until the first one recover.

I have a few questions about this implementation:

1. In which installation architecture should I perform this mission?

2. Is any restriction to do this task with Netweaver 640 SR1?

3. Are we need other (except Netweaver) softwares or hardwares for this mission? If yes which?

4. Any helpful tip or idea will be appreciated.

Thanks in advance

Yoel

[Former Member]

We clustered two Microsoft windows 2003 servers

We have had over 99% availability since going live last year. the 1% was for maintenance.

We installed one as an application server one as database server and have failover functionality.

We added this http://www.microsoft.com/windowsserver2003/technologies/clustering/default.mspx

[Former Member]

A suggestion:

Put your database and central in a fail over cluster.

Use 2 (or more) application servers.

Run the sapwebdispatcher on the central instance.

If you don't need the application/dialog servers yet, you should still use the sapwebdispatcher. That will save you lots of work if you need to expand your environment later.

-AD

[Former Member]

Hi Yoel,

I think this document probably could be helpful to answer your questions.

<a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/ee7fa790-0201-0010-5aac-a0b2f0e94982">SAP Exchange Infrastructure in High Availability Environments</a>

If you have not already done it I suggest you to post this question on Exchange Infrastructure forum as well.

Kind Regards,

Sergio