Hi
Thanks Steven and Jan.
OK, so "passive" mode seems to be more safer for now ...
So questions about passive mode, just to clarify completely the behavior
(I think it could be useful for all users) :
1/ in the case both networks are up and working, is by default the ring
0 used at first, and ring 1 as backup ? or is it a little bit random ?
2/ following failure on first ring, if the protocol switches to the
backup ring, and then the first ring comes up and working again,
does the protocol switches back to first ring, or does it remain on
backup ring until
a. either if backup ring fails at its turn, or
b. stack HA is re-started on all nodes
3/ if in case 2/ it switches back on first ring, let's say we re-start
HA stack on only one node of the HA cluster, does it also switch back to
first ring , or does it remain on the ring
currently used by the other(s) node(s)
Thanks
Alain
Le 27/11/2013 16:54, Jan Friesse a écrit :
Alain,
passive mode is much better tested. Another big plus of passive is, that
if one network becomes faulty, passive makes progress (one packet is
send thru active device, another via faulty - this is not delivered but
resend via active device, ...). Active RRP waits until enough failures
and then marks device/ring failed. In this meantime, there is no
progress (packet must be delivered via both interfaces).
Moullé Alain napsal(a):
Hi,
the man page of corosync.conf gives :
"Active replication offers slightly lower latency from transmit to
delivery in faulty network environments but with less performance.
Passive replication may nearly double the speed of the totem protocol if
the protocol doesn’t become cpu bound"
OK but knowing that, could someone give the pro & cons for passive mode,
and the pro & cons for active mode,
and/or how must we choose the real better mode for a HA cluster ?
Passive. It's only one supported.
Thanks a lot
Alain
Regards,
Honza
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