Yes always have 2 interconnect switches for sure. Also if you switch interconnect to UDP for Oracle, it will still work with a few modifications using 2 switches.
For me having 2 switches for public solved most networking blunders. IT is "OK" cluster wise if the DG goes away. Traffic just stops, big deal. That is the network teams issue. Have lived through it many times. C On Mon, Oct 20, 2008 at 9:52 AM, Jim Senicka <[EMAIL PROTECTED]>wrote: > I would be more concerned about future failures being handled properly. > If you were able to take out all networks from all nodes at same time, > you have a SPOF. If this was a one time maintenance upgrade to your > network gear and not a normal event, setting VCS to not respond to > network events means that future cable or port issues will not be > handled. > If it is a common occurrence for all networks to be lost, perhaps you > need to address the network issues :-) > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > DeMontier, Frank > Sent: Monday, October 20, 2008 11:10 AM > To: Paul Robertson; veritas-ha@mailman.eng.auburn.edu > Subject: Re: [Veritas-ha] IPMultiNICB, mpathd and network outages > > FaultPropagation=0 should do it. > > Buddy DeMontier > State Street Global Advisors > Infrastructure Technical Services > Boston Ma 02111 > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Paul > Robertson > Sent: Monday, October 20, 2008 10:37 AM > To: veritas-ha@mailman.eng.auburn.edu > Subject: [Veritas-ha] IPMultiNICB, mpathd and network outages > > We recently experienced a Cisco network issue which prevented all > nodes in that subnet from accessing the default gateway for about a > minute. > > The Solaris nodes which run probe-based IPMP reported that all > interfaces had failed because they were unable to ping the default > gateway; however, they came back within seconds once the network issue > was resolved. Fine. > > Unfortunately, our VCS nodes initiated an offline of the service group > after the IPMultiNICB resources detected the IPMP fault. Since the > service group offline/online takes several minutes, the outage on > these nodes was more painful. Furthermore, since the peer cluster > nodes in the same subnet were also experiencing the same mpathd fault, > there would have been little advantage to failing over the service > group to another node. > > We would like to find a way to configure VCS so that the service group > does not offline (and any dependent resources within the service group > are not offlined) in the event of an mpathd (i.e. IPMultiNICB) > failure. In looking through the documentation, it seems that the > closest we can come is to increase the IPMultiNICB ToleranceLimit from > "1" to a huge value: > > # hatype -modify IPMultiNICB ToleranceLimit 9999 > > This should achieve our desired goal, but I can't help thinking that > it's an ugly hack, and that there must be a better way. Any > suggestions are appreciated. > > Cheers, > > Paul > > P.S. A snippet of the main.cf file is listed below: > > > group multinicbsg ( > SystemList = { app04 = 1, app05 = 2 } > Parallel = 1 > ) > > MultiNICB multinicb ( > UseMpathd = 1 > MpathdCommand = "/usr/lib/inet/in.mpathd -a" > Device = { ce0 = 0, ce4 = 2 } > DefaultRouter = "192.168.9.1" > ) > > Phantom phantomb ( > ) > > phantomb requires multinicb > > group app_grp ( > SystemList = { app04 = 0, app05 = 0 } > ) > > IPMultiNICB app_ip ( > BaseResName = multinicb > Address = "192.168.9.34" > NetMask = "255.255.255.0" > > Proxy appmnic_proxy ( > TargetResName = multinicb > ) > > (various other resources, including some that depend on app_ip > excluded for brevity) > > app_ip requires appmnic_proxy > _______________________________________________ > Veritas-ha maillist - Veritas-ha@mailman.eng.auburn.edu > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-ha > > _______________________________________________ > Veritas-ha maillist - Veritas-ha@mailman.eng.auburn.edu > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-ha > > _______________________________________________ > Veritas-ha maillist - Veritas-ha@mailman.eng.auburn.edu > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-ha > -- "You can't wait for inspiration. You have to go after it with a stick" - Jack London
_______________________________________________ Veritas-ha maillist - Veritas-ha@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-ha
