Excessive log switching after upgrading to RAC + DG

Hi everyone, I'm not sure if this should go in the RAC or the Data Guard section, seeing how I'm not sure which one is the potential culprit, but here goes:
I recently assisted in upgrading a database from Solaris 9i to HP-UX 10gR2 (10.2.0.4) using RAC and Data Guard (2 nodes). However after upgrading we noticed that there is now an increase in the redo log switches. We currently have 4 logfile groups for each thread sized at 100MB. Previously when the database was just a single instance, such a configuration was sufficient as we were only seeing 4 log switches per hour, max 8 at peak times. After the migration, this spiked up to around 40-60 log switches per hour, sometimes hitting 80.
The userbase/load of the database hasn't changed since the upgrade, we just migrated the database. Is this normal? Should I have to increase the redo logs after migrating to RAC + DG? I've implemented DG before as well as RAC, but not together so I'm not sure if this would be a factor, however I'm not totally sure if that line of thinking is correct. Any help would be much appreciated.

Previously when the database was just a single instance, such a configuration was sufficient as we were only seeing 4 log switches per hour, max 8 at peak times. After the migration, this spiked up to around 40-60 log switches per hour, sometimes hitting 80. Are all the ArchiveLogs actually 100MB each ? If Oracle has to switch logs more frequently, it doesn't necessarily mean that more Redo is being generated. Check the volum of Redo. (e.g. from v$sysstat, from StatsPack, from AWR, from V$ARCHIVED_LOG or by just listing the ArchiveLog file sizes)
Hemant K Chitale

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Hi;
Please check below notes which could be helpful for your issue:
Diagnosing excessive redo generation [ID 199298.1]
Excessive Archives / Redo Logs Generation Troubleshooting [ID 832504.1]
Troubleshooting High Redo Generation Issues [ID 782935.1]
How to Disable (Temporary) Generation of Archive Redo Log Files [ID 177218.1]
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