This was certainly news to me. In this full-mesh heartbeat network, do we still go into jeopardy if the network links are lost relatively slowly (e.g. if one link on a node is down for more than 16 seconds by default)?
On Sun, May 3, 2009 at 1:07 PM, Sandeep Agarwal (MTV) < sandeep_agarw...@symantec.com> wrote: > From 5.0MP3 onwards we do support cross-links. In your example if you > had a cable connecting sw1 and sw2 then the failure that you described > would be handled and LLT would still have 1 valid link between node 1 > and node 4. > > -----Original Message----- > From: veritas-ha-boun...@mailman.eng.auburn.edu > [mailto:veritas-ha-boun...@mailman.eng.auburn.edu] On Behalf Of Jim > Senicka > Sent: Sunday, May 03, 2009 9:23 AM > To: Imri Zvik > Cc: veritas-ha@mailman.eng.auburn.edu > Subject: Re: [Veritas-ha] LLT heartbeat redundancy > > LLT is designed to use "jeopardy" to detect the difference between > single link fail and dual link fail in most situations. Having a single > mesh may remove this capability. > > Let me check on this with engineering and see if we have any more up to > date recommendations > > > -----Original Message----- > From: veritas-ha-boun...@mailman.eng.auburn.edu > [mailto:veritas-ha-boun...@mailman.eng.auburn.edu] On Behalf Of Imri > Zvik > Sent: Sunday, May 03, 2009 12:18 PM > To: Jim Senicka > Cc: veritas-ha@mailman.eng.auburn.edu > Subject: Re: [Veritas-ha] LLT heartbeat redundancy > > On Sunday 03 May 2009 19:03:16 Jim Senicka wrote: > > This is not a limitation, as you had two independent failures. Bonding > > > would remove the ability to discriminate between a link and a node > > failure. > > I didn't understand this one - With bonding I can maintain full mesh > topology - No matter which one of the links fails, if a node still has > at least one active link, LLT will still be able to see all the other > nodes. > This achieves greater HA than without the bonding. > > > > My feeling is in the scenario you describe, VCS is operating properly, > > > and it is not a limitation. > > Of course it is operating properly - that's how it was designed to work > :) > I'm just saying that the cluster could be more redundant if it wasn't > designed that way :) > > > If you have issues with port or cable failures, add a low pri > connection > > on a third network. > > > > _______________________________________________ > 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 >
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