Yes, the jeopardy detection etc has not changed.
We've just added support for this new type of topology in which the
various LLT links are interconnected (crosslinks).
-----Original Message-----
From: John Cronin [mailto:[email protected]]
Sent: Friday, May 08, 2009 6:58 AM
To: Sandeep Agarwal (MTV)
Cc: Jim Senicka; Imri Zvik; [email protected]
Subject: Re: [Veritas-ha] LLT heartbeat redundancy
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)
<[email protected]> 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: [email protected]
[mailto:[email protected]] On
Behalf Of Jim
Senicka
Sent: Sunday, May 03, 2009 9:23 AM
To: Imri Zvik
Cc: [email protected]
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: [email protected]
[mailto:[email protected]] On
Behalf Of Imri
Zvik
Sent: Sunday, May 03, 2009 12:18 PM
To: Jim Senicka
Cc: [email protected]
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.
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