Replacement of Oracle RAC Pvt. Interconnect from Cross-Cable to Switch

Hi,
Previsouly i configured my Oracle 10g RAC R2 with a cross cable b/w two nodes for Cluster Interconnectivity but now due to numerously rebooting issue i am going to replace it with a dedicated Gigbit Ethernet Switch, by doing so would it effect my previous coonfiguration of RAC clusterware or changes of any sort ??? I am keeping the same IP Scheme for my Public, Private and Virtual Interfaces.
Anyhelp on this would be highly appreciated.
Thanx in advance

Check the nic mtu by
ifconfig -a
if your interconnect NIC is configured with mtu is 1500 (which is the default mtu) or 9000 value make sure the your switch is configured with the same mtu value
once the above s done then
switch off machine.
replace the cross cable with ethernet switch
startup the machine. and start your clusters and services.

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    2) What is the recommended Private Cluster Interconnect for Oracle RAC ? GiG ethernet or SCI with RSM ?
    3) How about the scenarios where one can have say 3 X Gig Ethernet V/S 2 X SCI , as their cluster's Private Interconnects ?
    4) How the Interconnect traffic gets distributed amongest the multiple GigaBit ethernet Interconnects ( For oracle RAC) , & is anything required to be done at oracle Rac Level to enable Oracle to recognise that there are multiple interconnect cards it needs to start utilizing all of the GigaBit ethernet Interfaces for transfering packets ?
    5) what would happen to Oracle RAC if one of the Gigabit ethernet private interconnects fails
    Have tried searching for this info but could not locate any doc that can precisely clarify these doubts that i have .........
    thanks for the patience
    Regards,
    Nilesh

    Answers inline...
    Tim
    Can any one pls confirm if it's possible to configure
    2 or more Gigabit Ethernet interconnects ( Sun
    Cluster 3.1 Private Interconnects) on a E6900
    cluster ?Yes, absolutely. You can configure up to 6 NICs for the private networks. Traffic is automatically striped across them if you specify clprivnet0 to Oracle RAC (9i or 10g). That is TCP connections and UDP messages.
    It's for a High Availability requirement of Oracle
    9i RAC. i need to know ,
    1) can i use gigabit ethernet as Private cluster
    interconnect for Deploying Oracle RAC on E6900 ? Yes, definitely.
    2) What is the recommended Private Cluster
    Interconnect for Oracle RAC ? GiG ethernet or SCI
    with RSM ? SCI is or is in the process of being EOL'ed. Gigabit is usually sufficient. Longer term you may want to consider Infiniband or 10 Gigabit ethernet with RDS.
    3) How about the scenarios where one can have say 3 X
    Gig Ethernet V/S 2 X SCI , as their cluster's
    Private Interconnects ? I would still go for 3 x GbE because it is usually cheaper and will probably work just as well. The latency and bandwidth differences are often masked by the performance of the software higher up the stack. In short, unless you tuned the heck out of your application and just about everything else, don't worry too much about the difference between GbE and SCI.
    4) How the Interconnect traffic gets distributed
    amongest the multiple GigaBit ethernet Interconnects
    ( For oracle RAC) , & is anything required to be done
    at oracle Rac Level to enable Oracle to recognise
    that there are multiple interconnect cards it needs
    to start utilizing all of the GigaBit ethernet
    Interfaces for transfering packets ?You don't need to do anything at the Oracle level. That's the beauty of using Oracle RAC with Sun Cluster as opposed to RAC on its own. The striping takes place automatically and transparently behind the scenes.
    5) what would happen to Oracle RAC if one of the
    Gigabit ethernet private interconnects fails It's completely transparent. Oracle will never see the failure.
    Have tried searching for this info but could not
    locate any doc that can precisely clarify these
    doubts that i have .........This is all covered in a paper that I have just completed and should be published after Christmas. Unfortunately, I cannot give out the paper yet.
    thanks for the patience
    Regards,
    Nilesh

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