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question on replacing libskgxn2.so file in OracleHome running 10.2.0.3 with SFRAC4.1MP2 for Solaris

Jawahar_Mohan
Level 3
Employee

‎09-08-2008 01:32 PM

After a Oracle patch upgrade (to 10.2.0.3) on SFRAC 4.1MP2 Solaris, if libskgxn2.so in $ORACLE_HOME/lib is different from /opt/VRTSvcs/rac/lib, should it be replaced? 

I understand that /opt/ORCLcluster/lib/libskgxn2.so has to be replaced if its diff from /opt/VRTSvcs/rac/lib as this lib is responsible for Oracle’s communication with Clusterware. One of my customer also mentioned that in 9i it was necessary to copy Veritas’s libskgxn into $ORACLE_HOME. I did not know why they were doing this. In 10.2.0.1, there was no $ORACLE_HOME/lib/libskgxn2.so so there was no copy required. It looks like in 10.2.0.3, Oracle changed things and started placing libskgxn2.so into $ORACLE_HOME/lib which is different from /opt/ORCLcluster/lib. I am not sure if $ORACLE_HOME/lib/libskgxn2.so has to be replaced or not. I can’t find any reference to replacing $ORACLE_HOME/lib/libskgxn2.so in the 4.1 install guide or MP release documents so I guess we don’t have to replace this. But, many of my peers recommanded copying this library over but don't have a reference doc. or technote that explains why.

  $ ls -l /opt/VRTSvcs/rac/lib/libskgxn*
lrwxrwxrwx   1 root     other         19 Feb  2  2007 /opt/VRTSvcs/rac/lib/libskgxn2_32.so -> ./libskgxn2_32.so.1
-rwxrwxr-x   1 root     sys        40284 Nov 22  2006 /opt/VRTSvcs/rac/lib/libskgxn2_32.so.1
lrwxrwxrwx   1 root     other         19 Feb  2  2007 /opt/VRTSvcs/rac/lib/libskgxn2_64.so -> ./libskgxn2_64.so.1
-rwxrwxr-x   1 root     sys        52496 Nov 22  2006 /opt/VRTSvcs/rac/lib/libskgxn2_64.so.1  $ ls -l /opt/ORCLcluster/lib/libskgxn*
-r-xr-xr-x   1 oracle   other      52496 Aug 30 20:37 /opt/ORCLcluster/lib/libskgxn2.so  $ ls -l $ORACLE_HOME/lib/libskgxn*
-rw-r--r--   1 oracle   oinstall   11264 Dec  1  2006 /pdbs/oracle10g/oracle/product/10.2.0.3a/lib/libskgxn2.so
-rw-r--r--   1 oracle   oinstall   11328 Dec 20  2006 /pdbs/oracle10g/oracle/product/10.2.0.3a/lib/libskgxns.so
$ ls -l $ORA_CRS_HOME/lib/libskgxn*
lrwxrwxrwx   1 oracle   other         33 Sep  2 13:27 /pdbs/oracle10g_crs/product/10.2.0.4/lib/libskgxn2.so -> /opt/ORCLcluster/lib/libskgxn2.so
-r-xrw-r--   1 oracle   oinstall   12528 Apr  4 04:29 /pdbs/oracle10g_crs/product/10.2.0.4/lib/libskgxns.so 

 

Thanks,

Jawahar Mohan

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1 REPLY 1

George_Lombard
Level 3

‎02-15-2009 02:31 PM

Hi Jawahar,

 

My understanding about libskgxn2 is that it needed for Oracle DB communication withing the cluster. VCS provides the channel for Oracle to send messages to the other DB and you need that library at place for Oracle to call it, should it want to talk to the other DB.

 

You can find out from the alert.log if it could establish a communication to the other side.

If everything's working OK, then the message you find should be similar to the following:

 

|  cluster interconnect IPC version:
|          VERITAS IPC 2.2.1.0.1.0 32 17:11:49 Dec 12 2002
|  IPC Vendor 86 proto 76 Version 1.0

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