![](/images/backgrounds/286000/hp-serviceguard-metrocluster-users-guide-66984531x1.png)
Figure 3 Failover Scenario with Two Arbitrators
The scenarios in Table 5 illustrate possible results if a data center or one or more nodes fail in a configuration with two arbitrators. Note that 3 of the 4 scenarios that caused a cluster halt with a single arbitrator, do not cause a cluster halt with two arbitrators.
Table 5 Node Failure Scenarios with Two Arbitrators
Failure | Quorum | Result | |
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|
| |
data center A (nodes 1 and 2) | 4 of 6 (67%) | pkg A and B switch to data center B | |
|
|
| |
data center A, then arbitrator 1 | 3 of 4 (75%) | pkg A and B switch, then no change | |
|
|
| |
data center A and arbitrator 1 | 3 of 6 (50%) | cluster halts* | |
|
|
| |
data center A, then arbitrator 1, then node 3 | 2 of 3 (67%) | pkg A, B, and C switch | |
|
|
|
|
arbitrator 1, then data center A | 3 of 5 | (60%) | pkg A and B switch to data center B |
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|
|
|
node 3, then data center A | 3 of 5 | (60%) | pkg A and B switch to data center B |
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|
|
|
data center B | 4 of 6 | (67%) | pkg C and D switch to data center A |
|
|
|
|
third location | 4 of 6 | (67%) | no change |
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|
|
|
* Cluster can be manually started with the remaining node.
Worksheets
Disaster Tolerant Checklist
Use this checklist to make sure you have adhered to the disaster tolerant architecture guidelines for a two main data centers and a third location configuration.
Worksheets 31