EM for two instances

hello gurus,
could somebody explain me, please, how to run the EM, where are two instances? I mean, what i have to do to switch EM between two instances?
sorry, if this is a stupid question, i'm only the beginner.
thank you again.
M

thank you, Mohammad Taj, i surmised that there must be a way without using the grid, but tried to install it anyway.
and now, that is the error, that arises in the middle of installation, on the Specify Repository Configuration step:
"Exception occured while connecting to database. Please check the connection details of the database you specified and retry. Bad packet type."
the "Prefill tablespace locations" button doesn't work also. i'm absolutely sure about the specified details (database hostname, port, service/SID, syspassword), but still can't advance.
BTW, thank you again, both OEM work fine on one machine^
C:\Documents and Settings\Dmitry>set ORACLE_SID=catalog
C:\Documents and Settings\Dmitry>emctl start dbconsole
Oracle Enterprise Manager 10g Database Control Release 10.1.0.2.0
Copyright (c) 1996, 2004 Oracle Corporation. All rights reserved.
http://DIGHOME:5501/em/console/aboutApplication
Starting Oracle Enterprise Manager 10g Database Control ...The OracleDBConsolecatalog service is starting..
The OracleDBConsolecatalog service was started successfully.
C:\Documents and Settings\Dmitry>set ORACLE_SID=recovery
C:\Documents and Settings\Dmitry>emctl status dbconsole
Oracle Enterprise Manager 10g Database Control Release 10.1.0.2.0
Copyright (c) 1996, 2004 Oracle Corporation. All rights reserved.
http://DIGHOME:5500/em/console/aboutApplication
Oracle Enterprise Manager 10g is running.
Logs are generated in directory C:\oracle\product\10.1.0\db_1/DIGHOME_recovery/sysman/log
thank you again.
Maria.

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    I setup two nodes RAC 9.2.0.2 in HP Alpha OpenVMS 8.2 , one node is CAPL21(instance number=1) and another is CAPL22(instance number=2) . when normally run about five days. the second instance CAPL22 terminated abnormally, I check the alert and trace file as follows:
    6-AUG-2008 06:29:39.82:
    Errors in file $1$DGA2:[ORACLE.V9.ADMIN.YUSDB.BDUMP]CAPL22_YUSDB2_BG_LMS1_007.TRC;:
    ORA-00600: internal error code, arguments: [kjctr_rksxp:rcvr], [1], [2], [], [], [], [], []
    6-AUG-2008 06:29:40.32:
    Errors in file $1$DGA2:[ORACLE.V9.ADMIN.YUSDB.BDUMP]CAPL22_YUSDB2_BG_LMS1_007.TRC;:
    ORA-00603: ORACLE server session terminated by fatal error
    ORA-00600: internal error code, arguments: [kjctr_rksxp:rcvr], [1], [2], [], [], [], [], []
    6-AUG-2008 06:29:46.60:
    Errors in file $1$DGA2:[ORACLE.V9.ADMIN.YUSDB.BDUMP]CAPL22_YUSDB2_BG_LMS1_007.TRC;:
    ORA-00600: internal error code, arguments: [ksxpcncl3], [], [], [], [], [], [], []
    ORA-00603: ORACLE server session terminated by fatal error
    ORA-00600: internal error code, arguments: [kjctr_rksxp:rcvr], [1], [2], [], [], [], [], []
    6-AUG-2008 06:29:47.38:
    Errors in file $1$DGA2:[ORACLE.V9.ADMIN.YUSDB.BDUMP]CAPL22_YUSDB2_BG_LMS1_007.TRC;:
    ORA-00600: internal error code, arguments: [ksxpcncl3], [], [], [], [], [], [], []
    ORA-00603: ORACLE server session terminated by fatal error
    ORA-00600: internal error code, arguments: [kjctr_rksxp:rcvr], [1], [2], [], [], [], [], []
    6-AUG-2008 06:30:37.33:
    Errors in file $1$DGA2:[ORACLE.V9.ADMIN.YUSDB.BDUMP]CAPL22_YUSDB2_BG_PMON_002.TRC;:
    ORA-00484: LMS* process terminated with error
    6-AUG-2008 06:30:37.33:
    PMON: terminating instance due to error 484
    6-AUG-2008 06:30:37.37:
    Errors in file $1$DGA2:[ORACLE.V9.ADMIN.YUSDB.BDUMP]CAPL22_YUSDB2_BG_LMD0_005.TRC;:
    ORA-00484: LMS* process terminated with error
    6-AUG-2008 06:30:37.37:
    Errors in file $1$DGA2:[ORACLE.V9.ADMIN.YUSDB.BDUMP]CAPL22_YUSDB2_BG_LMS0_006.TRC;:
    ORA-00484: LMS* process terminated with error
    6-AUG-2008 06:30:37.40:
    System state dump is made for local instance
    6-AUG-2008 06:30:37.56:
    Trace dumping is performing id=[cdmp_20080806063037]
    6-AUG-2008 06:30:42.47:
    Instance terminated by PMON, pid = 20401500
    Starting up ORACLE RDBMS Version: 9.2.0.2.0.
    Oracle Bug? who can help me? Thanks in advance.
    Message was edited by:
    Efrain

    > I use 100M switch not Gibit switch, maybe it's also problem?
    Could be.. but one will need to look at the interface stats and switch stats to see whether the interconnect is coping.
    For 2 nodes, a decent interconnect is not that expensive. 2 HBC cards and small Inifiband switch.
    RAC is only as robust as the hardware it is running on.

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