Rebuild our XI application server from Single stack to dual stack

Question

Hello,
We currently have an XI landscape with two application servers, the CI is of course a dual stack system, however the two app servers are single stacked, however we would like to make the two app servers into DUAL STACKs, my first guess was to rebuild the two apps from scratch and reinstall them as a dual stack apps. My Q is:
First: Do we need to rebuild both app servers, or can we make a change to the app servers to modify them to become dual stacked
Second: If we do need to rebuild both these apps, is there a specific document available to do this on Market place for installing a Dual stack app servers with PI?
Thanks in advance.
Sam
<Moved from SAP PI Forum>
Edited by: Prateek Raj Srivastava on May 13, 2010 12:27 PM

Answer 1

Hello,
Thank you all for your feedback,
Denny Liao, it is very interesting question you implied, we do have a J2EE directory created under the /usr/sap/SID/D30 directory:
/usr/sap/XQ9/D30
mqaapz28:xq9adm 13% ls -ltr
total 36
drwxr-xr-x   7 xq9adm   sapsys        96 Aug 24  2009 igs
drwxr-xr-x   9 xq9adm   sapsys      1024 Aug 24  2009 j2ee
drwxr-xr-x   2 xq9adm   sapsys      1024 Nov 11  2009 sec
drwxr-xr-x   3 xq9adm   sapsys      1024 Nov 24 10:48 log
obviously this app server does not have any (jlaunch/jcontrol process running) therefore it is not running as dual stacked. but interestingly enough I do see logs in the
/usr/sap/XQ9/D30/j2ee/cluster/server0/log directory created at the time of the initial install. and under:
/usr/sap/XQ9/D30/j2ee/cluster
mqaapz28:xq9adm 29% ls -ltr
total 30
drwxr-xr-x   2 xq9adm   sapsys      1024 Aug 24  2009 bootstrap
-rw-rr   1 xq9adm   sapsys        39 Aug 24  2009 version.bin
-rw-rr   1 xq9adm   sapsys      6339 Aug 24  2009 instance.properties.vmprop
-rw-rr   1 xq9adm   sapsys      3676 Aug 26  2009 instance.properties
drwxr-xr-x   7 xq9adm   sapsys      1024 Aug 26  2009 dispatcher
drwxr-xr-x  11 xq9adm   sapsys      1024 Aug 26  2009 server0
as per the note you mentioned above (741289 ) this explains how to recover a lost J2EE parameter setup, I am guessing this can be simply followed and re-enable the app server to run as a dual stack.
also my system information for the J2EE on the CI is:
System XQ9   
Find other systems in SLD... Message Server 
Host:  mcsapxq9j 
Port:  3924 
Enqueue Server 
Host:  mcsapxq9j 
Port:  3224 
Database 
Name:  XQ9 
Host:  mcsapxq9dbx 
Type:  Oracle (Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - 64bit Production With the Partitioning and Data Mining options) 
Software Components  all components... 
Name  Version  Applied 
sap.com/SAP-JEECOR  7.00 SP21 (1000.7.00.21.0.20091214121410)  20100506125119 
sap.com/SAP-JEE  7.00 SP21 (1000.7.00.21.0.20091214121301)  20100506124943 
Licenses 
Installation Number  *** not yet assigned *** 
System Number  *** not yet assigned *** 
Software Product  Days Until Expiry 
Download system configuration 
Instance mqacsz27_XQ9_30  All processes running 
Host:  mqacsz27 
OS:  SunOS (sparcv9) 5.10 
dispatcher  Running 
VM  system properties... 
PID:  21384 
Name:  Java HotSpot(TM) 64-Bit Server VM 
Vendor:  Sun Microsystems Inc. 
Version:  1.4.2_21-b03 
VM Parameters 
Cluster 
Node ID:  301932700 
Kernel Version:  7.00 PatchLevel 76340.450 
HTTP Port:  53000 
HTTPS Port:  53001 
P4 Port:  53004 
Telnet Port:  53008 
Info for crashes of this node 
server0  Running 
VM  system properties... 
PID:  21394 
Name:  Java HotSpot(TM) 64-Bit Server VM 
Vendor:  Sun Microsystems Inc. 
Version:  1.4.2_21-b03 
VM Parameters 
Cluster 
Node ID:  301932750 
Kernel Version:  7.00 PatchLevel 76340.450 
Info for crashes of this node 
SDM  Running 
VM    
PID:  21400 
SDM Port:  53018 
So: besides setting up the parameters in the above Note and consider the Load balancing, as there any other major setups required to start this app server as a dual stacked instance?
Thanks in advance.
SAM
Edited by: SAM_ONE on May 14, 2010 3:45 AM
Edited by: SAM_ONE on May 14, 2010 3:55 AM