Failover did not happen when one node went down!!! PLEASE HELP

Hi gurus,
Yesterday one disaster struck my RAC database. We have two node cluster and it is 10.2.0.2, both of them located in different sites, yesterday suddenly power went down and the one of the network switch went down and got destructed, node one of RAC database was connected to that switch, but the failover did not happen to the node two as this should be the case when one node goes down the other should be available for all the node one sessions/connections.
when I tried to ping/telnet the node 1, it was not happening because the switch was down, the network guyz connected the cables to other switch available. When I connected to the node 1, it was showing "Oracle is not available" message.
And when I tried the other node, it was the same case but I did not see any error in alert log file. Then my TL restarted both the nodes and then the database was available.
I am very confused that how the failover did not happen and how the database went down, PLEASE suggest something to how to identifiy what was happened. Thanks & Regards

Thanks for your reply,
after the network switch was replaced we connected to both the nodes and found that the instances are down with no reason given in the Alertlog file. We just restarted both the instances and then the database was up and the clients connected to both the instances with equal sessions on both the instances. I want to know that whether the failover can be done at the application side or it should be done on the database side i,e; in tnsnames.ora file with the required parameters? as in our scenario there is no failover configuration in the tnsnames.ora file.
Thanks & Regards

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    Edited by: user1221 on Mar 18, 2009 1:09 AM

    About Oracle RAC ... you have 2 nodes ... You have to connect 4 IPs.
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    Please check if '''Open new windows in a new tab instead''' is enabled in '''Tools''' ('''Alt''' + '''T''') > '''Options''' > '''Tabs'''. [https://support.mozilla.org/en-US/kb/Options%20window%20-%20Tabs%20panel Options > Tabs]. If the problem persists, please also check if this happens in a [https://support.mozilla.org/en-US/kb/Managing-profiles new profile]. If the new profile is okay, you can later [https://support.mozilla.org/en-US/kb/Recovering%20important%20data%20from%20an%20old%20profile?s=profile&r=1&e=sph&as=s copy the needed personal data] from the old profile. Firefox stores your personal data and settings in [http://kb.mozillazine.org/Profile_folder another location (profile folder)] separate from its [http://kb.mozillazine.org/Installation_directory files/folder]. A new profile would have the default Firefox settings ('''Tools''' ('''Alt''' + '''T''') > [https://support.mozilla.org/en-US/kb/Options%20window '''Options'''], and [http://kb.mozillazine.org/About:config about:config] ), and usually would also be empty of any '''Extensions''' and themes ('''Appearance''') in Tools > Add-ons) and their settings. Also, a new profile would have no previous stored website data/settings etc., ('''Tools''' > [https://support.mozilla.org/en-US/kb/Clear%20Recent%20History '''Clear Recent History''']).
    [https://support.mozilla.org/en-US/kb/Profiles?s=profile&r=2&e=sph&as=s Profiles Howto]
    [http://kb.mozillazine.org/Profile_folder_-_Firefox Profile Folder & Files]
    [http://kb.mozillazine.org/About:config_entries about:config Entries]

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