04-07-2009 06:23 PM
04-08-2009 01:05 AM
> Question is that if one of host, say, host A, all the heartbeats is disconnected.
When a cluster reconfiguration happens, the lowest LLT ID system of any sub-cluster is responsible for racing for coordinator disks on behalf of the remaining nodes. The fencing algorithm will give the larger sub-cluster an advantage in the race for control of the coordinator disk. Therefore it is likely that only Host A will panic.
> If this is correct, how many fencing disks needed for such case?
Fencing should still use the three recommended LUNs.
I wonder why are you already considering the different failure scenarios? Making the interconnect connection truly redundant (e.g. more than two private links, different NICs, different switches, different cabling paths, etc.) should be the better approach.
Regards
Manuel
04-08-2009 01:43 AM
HI Manuel,
Does LLT ID system means the number in /etc/llthosts ?
If yes, for example, we have the following:
0 A
1 B
2 C
3 D
If Host A lost heartbeat, only A and B will race for the fencing disk?
For the similiar case happen, if Host D lost heartbeat, and since C with lowest LLT ID between second samba failover resource group, C will be most case to be panic?
And Host A and B will not race for the Fencing disk?
For the redundant network issue, actually we did have it.
However, we need to the test for all the redundant network link is down in order to pass the aduit requirement.
Thanks,
Xentar
04-08-2009 11:36 AM
04-08-2009 06:15 PM
04-09-2009 01:25 PM