multiple dialog instances on one server

[former_member239633]

Hello all,

noob question..

I know it is possible to run two systems on a server, but is it also possible to run more than one dialog instance for the same system on one server? If so, are there any clear benefits other than simpler landscape administration?

Thanks

[Former Member]

You can have dialog instance on same server if your hardware capacity is good.

thanks

Prince Jose

[Former Member]

If the server has enough memory and CPU room, you can add additional instances. Since they belong to same SID, the environment files are in the same directory (<sid>adm home directory). You can use qualifiers for stopsap & startsap to manage individual instances (see below). Also, you want to have separate file systems for each instance (ie, /usr/sap/<SID>/<instance1> and /usr/sap/<SID>/<instance2> to avoid impacting each other when a file system gets full.

stopsap/startsap [r3|j2ee|all|check|ccms] [<instance>] [<virtual hostname>]

[former_member239633]

Thanks for the information RK. Is there anybody reading this that has their production landscape setup this way? Just looking for pros and cons from someone that is working on a system set up in this manner.

[Former Member]

We have mulltiple dialog running in same server. It would be helpful when you have Logon groups and also we use some dialog instance only for batch process ( if you have huge background load ) .

Why you are thinking about adding dialog instance ? Whats your hardware capacity ?

Thanks

Prince Jose

[Former Member]

Hi,

We actually use what I described above, in our production landscape. We have two appinstances on a eacho of our Sun V440s with 4CPUs and 16GB RAM.

-Thanks

[Former Member]

We also have the same setup.

sun V440 with actually three dialogue instances.

One for R3

one for SRM

and a JAVA instance for the portal.

Works perfectly witout problems.

We have the portal deployed to 6000 staff and about 1000 active concurrent users.

No issues.

[former_member239633]

Prince Jose,

We're thinking about shrinking our landscape when we upgrade to 64 bit kernel. Currently, we're running 9 app servers with eight 2.80GHz CPUs, 8GB RAM each. We'd like to go to 4 physical app servers w/ 16GB RAM on each. I'd like to know what the advantages and/or disadvantages are to installing possibly 4 dialog instances per physical server.

Edited by: Torrey Stephens on Apr 14, 2008 2:53 PM

[Former Member]

No advantages on installing multiple Appllicaton servers on different machines unless you have different production systems e.g. SRM and R3.

If you just have an Netweaver ECC system then you need one installed application server, with a high number of dialogue processes running on it.

Its the number of Dialogue processes, and the time these take to execute that impacts on performance.

James