Virtual system Name

Hello Friends,
We are doing EHP4 upgrade in our production system. Our production system is configured as follows
Example
Physical System: ABC
Virtual System:XYZ
Now the scenior is as
1.)When we log in to XYZ it goes to ABC . and when we log in to ABC it goes to ABC.
2.)the Profile - START and INSTANCE profile .
Its for the virtual system XYZ
and the Physical system is a soft link to this virtual system.
My query is
1.) What different approch should we take during the upgrade.
2.) I just started the upgrade and in the initial screen of INITIALIZATION we get the error that the
UNABLE TO DETECT AN ABAP AND/OR AS JAVA INSTANCE OF THE SAP SYSTEM ON HOST ABC.
Please Suggest
Anthony

Hi
For the issue encountered in Initialization phase of upgrade:
1. Ensure to download the latest EHPi tool from the service marketplace.
There were recent corrections to instance detection.
2. Make sure, the naming conventions for profiles are followed
as explained in SAP notes
96317 Host names during R/3 upgrade, tips & tricks (section 4)
962955 - Use of virtual TCP/IP host names;
23538 Problems due to inconsistent host name notation
3. Cleanup the profile directory and only leave the actually
used profiles in there. Move old profiles to a backup directory.
4. Use the niping -v command to verify the hostname used by the
system.
5. Make sure old instances of EHPi are not running any more.
Kill old EHPi processes as necessary.
6. Also add two parameters to the instance profile:
saplocalhost and saplocalhostfull
Regards,
Aidan
Edited by: Aidan McKiernan on Nov 3, 2010 10:28 AM

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hi,
what is the importance of virtual system...

Hi,
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I followed your link till
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