Question

Difference between load balancing & cluster

Asked by: laxmileela

Dear Support

Please describe the differnece between cluster & load balancing application server

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Asked On
2008-08-27 at 03:41:17ID23681452
Topics

Adobe JRun

,

Network Design & Methodology

Participating Experts
2
Points
500
Comments
7

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Answers

 

by: angelIIIPosted on 2008-08-27 at 03:42:52ID: 22323144

cluster: you have several nodes of which 1 is active
load balancing: you have several nodes, all active, and a single transaction/session goes to 1 of those actives "nodes".

note: both concepts can be combined, if needed.

 

by: maze-ukPosted on 2008-08-27 at 04:02:21ID: 22323262

just to complete what Angellll said:
clustering provides failover, while load balancing, well,... load balancing, but partial failover as well.

Here are to requests, R1 and R2, and two servers S1 and S2

If S1 and S2 are clustered:
R1 --> S1
R2 --> S1
and if S1 fails:
R1 --> S2
R2 --> S2

If S1 and S2 are load balanced:
R1 --> S1
R2 --> S2
and if S2 fails:
R1 --> S1
R2 --> X
R2 --> S1

What you need to know is that two servers clustered share the same Data, usually physically speaking (for example using a SAN)
Load balanced servers are not: they rely on replication mechanisms depending on the application.

 

by: laxmileelaPosted on 2008-08-27 at 05:34:51ID: 22323963

Dear Angell/Maze

Thnks for ur quick reply one more thing I want to clarify

1) Active Active Cluster ya loadbalancing
2) Active Passive

 

by: angelIIIPosted on 2008-08-27 at 05:44:43ID: 22324068

Active/Passive cluster means you have 2 nodes, and 1 is active. on failover, the passive node becomes the active one.

Active/Active cluster means you have 2 nodes with each 2 applications. in fact, that should be noted:
Active+Passive/Passive+Active.  so 1 node can have both applications running, while the other node has nothing (both applications passive on that node), or both nodes have 1 application running each.

again, you cannot "compare" clustering vs loadbalancing as such, it's 2 different concepts.

 

by: laxmileelaPosted on 2008-08-28 at 07:12:02ID: 22335034

Dear Support

Link for Windows Load balancing of 2 Servers & also how to load balance IIS Server

 

by: angelIIIPosted on 2008-08-28 at 08:17:53ID: 22335941

 

by: laxmileelaPosted on 2008-09-15 at 07:43:36ID: 31490629

Thnx Alot

20120131-EE-VQP-002

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