How to really work the backups

I thought the fault tolerance of consistency and had a few questions.

What determines where the backup data for a certain node will reside? That is to say; will be the backups to a single JVM all reside in another JAVA virtual machine or is there a second hash that determines the location of the backup and therefore backups to a single machine virtual JAVA will span several other Java virtual machines?

The answer to that obviously affects the fault tolerance. Is it possible that you can configure the consistency so that so that it guaranteed to be tolerant to 2 machines at default?

see you soon

Ben

>
The answer to that obviously affects the fault tolerance. Is it possible that you can configure the consistency so that so that it guaranteed to be tolerant to 2 machines at default?
>

1 consistency don't charge currently evenly balance more than a backup. So with two levels of backup, the second level of backup can be much more lumpy distribution than the first (which is evenly distributed).

2. any other backup levels are not guaranteed to increase resilience. In other words, it is possible to lose data with two servers going down at the same exact time, even with two levels of backup.

The documentation is not clear on this point, but we intend to update the documentation - and of course we have plans to improve the distribution algorithms in order to eliminate these problems.

Peace,

Cameron Purdy | The Oracle coherence
http://coherence.Oracle.com/

Tags: Fusion Middleware

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