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| Arbitration for Data Integrity in Serviceguard Clusters | |
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| Summary |
Table 1 | Comparison of Different Arbitration Methods (Continued) | ||
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Arbitration | Advantages |
| Disadvantages |
Mode |
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Quorum Server | • Can be used with |
| • Requires a separate system not |
| clusters of any size. |
| part of the cluster. |
| • Can serve up to 50 |
| • Only one IP address is used for |
| clusters/100 nodes. |
| quorum server. |
| • Can be used |
| • Does not permit multiple physical |
| Linux clusters at the |
| network pathways unless APA |
| same time. |
| (auto port aggregation) or channel |
| • Is free on the Distributed |
| bonding is used. LAN failure will |
|
| remove the QS from | |
| Components CD (shipped |
| |
|
| communication with the cluster, | |
| along with the SG |
| |
|
| though the cluster remains | |
| product CD). |
| |
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| running. | |
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| |
| • Provides faster failover |
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| time than cluster lock |
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| disk. |
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Arbitrator Nodes | • Offers protection for the |
| • Additional Serviceguard licenses |
| loss of an entire data |
| required for arbitrator nodes. |
| center in a metropolitan |
| • Additional hardware must be |
| or extended distance |
| |
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| provided, often in a data center | |
| cluster. |
| |
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| that is on a separate site. | |
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| |
| • Allows arbitration to be |
| • For those with multiple clusters, |
| done over longer |
| |
|
| arbitrator nodes can be very | |
| distances than disk |
| |
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| costly. | |
| locking. |
| |
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| |
| • Arbitrator nodes can be |
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| used for other |
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