Hi
About "switching between rings" , the information I had was that it is
dependant to rrp mode,
and in the case rrp mode is active, the information I had was that both
rings were used at
the same time ...
It is it right or wrong ?
Thanks
Alain
Le 17/10/2013 16:25, Digimer a écrit :
On 17/10/13 03:08, Ulrich Windl wrote:
Hi!
Nice explanation! I have one question: With multiple rings, is Corosync
expecting the tokens to rotate with the same speed? I'm thinking of a scenario
where both rings operate with different speeds, so the token will rotate at the
same speed at low or medium network load, but might rotate with different
speeds when the slower ring uses the full bandwidth. I have the impression that
Corosync makes one of the rings as faulty (for less than one second), then.
Regards,
Ulrich
I am not a dev, so I might not understand your question properly.
However, as I understand it, corosync uses one ring or the other. So if
a ring is considered faulty, it switches over to the other ring. How
this is determined, I do not know, though I suspect it's similar to how
node failure occurs.
As for speed, tokens are passed around as fast as possible. If the
network is slow for some reason, it will still go as fast as possible,
it just won't be as fast as the other ring. If the speed drops too much,
corosync will think a node has failed when it has not, which is why low
latency networks are needed for corosync (or you adjust the timing
values to be long enough to account for the slower speeds).
I'd love to hear a corosync dev chime in on this.
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