Re: [lvs-users] LVS + Database

To: YesGood <sayupirapo@xxxxxxxxx>, " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] LVS + Database
From: David Coulson <david@xxxxxxxxxxxxxxxx>
Date: Sun, 17 Jun 2012 19:14:12 -0400
On 6/17/12 7:04 PM, YesGood wrote:

> says:
> one that can accept connections and serves read-only queries is called 
> a /hot standby/ server.
That would require logic in the app to send read-only queries to the 
correct system.
>     You say you want it for performance, but when a system dies you
>     will need to be able to support your entire workload on one box.
> Please, Can you explain me more ?
Well, if you have 2 systems, and one fails, then you presumably need to 
be able to run everything you need one one box (or N-1 boxes, where N is 
the total number of systems you have).

In general, running active/active is way more complicated to build, 
support and troubleshoot than active/backup. Most likely, you think you 
need load balancing, but you really don't. Or, if you do to support your 
workload, then you're going to be having a bad day when you loose a system.


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