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Active and Passtive Replica..

Gurumurthy Ramamurthy
Ranch Hand

Joined: Feb 13, 2003
Posts: 272
Hi,
What is:
1. Active Replica
2. Passive Replica
3. Hot Backup
4. Warm Backup
5. Cold Backup
Thanks
Guru
Lasse Koskela
author
Sheriff

Joined: Jan 23, 2002
Posts: 11962
    
    5
What's the context and source? For example, "hot replica" could mean anything from a stolen replica pistol to a cheap PC clone being sold out in 5 minutes...


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Gurumurthy Ramamurthy
Ranch Hand

Joined: Feb 13, 2003
Posts: 272
it is :
Active replication
Passive replication
Guru
Lasse Koskela
author
Sheriff

Joined: Jan 23, 2002
Posts: 11962
    
    5
Ok.
Here's what they might refer to (each vendor might use the same terms to mean different things so *I'm really not sure*):
Active replication: Every state change is actively replicated to the backup.
Passive replication: State is stored periodically. Backup reads the log file upon failover to reconstruct the correct state.
Chris Mathews
Ranch Hand

Joined: Jul 18, 2001
Posts: 2712
Active Replication replicates components and services across all possible nodes in the cluster. This replication strategy was used in the initial release of JBoss 3.0.
Passive Replication (also called Primary-Backup) chooses a primary node and a list of backup nodes for each component or service. The primary node processes all requests and sends updates to the backup nodes. This replication strategy is used by most commericial application servers including WebLogic.
There are trade-offs to both approaches, however most scalable servers use a form of Passive Replication.
 
Consider Paul's rocket mass heater.
 
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