Re: Question about data_dir and attachment_dir when using MySQL backend with squirrelmail

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Tomas Kuliavas wrote:

> Use load balancer which keeps current connection on one web host.

Hi Tomas.  Thank you for your response.  Unfortunately, I do not yet 
have a stateful load-balancer available to me.

> 
> Attachment directory stores temporary data. It does not matter which host
> stores it as long as web client keeps talking to same host during session.
> Address books and user preferences are stored in shared location, because
> this data must be shared between web hosts. You don't know which web host
> will be used by load balanced web client.
> 

I can see how it makes sense to store preferences and addressbook data 
in a database when using a stateful load-balancer in front of a 
multi-webserver configuration.  Both of those sets of data need to 
persist long-term, spanning the duration of multiple sessions.

I still fail to see much benefit to using ADODB to store session data in 
a database with this configuration, as the session data could just be 
stored in a local filesystem if a stateful load-balancer is being used. 
  When writing session data to local disk, the configuration is much 
simpler and the chance of any type of transient failure to access 
session data would be greatly reduced.

If I come across as being argumentative about this, I don't mean to be 
and I do apologize.  It just seems strange that folks have put effort 
into documenting this and making it work when there seems to be no 
compelling use for it.  It's because of this that I asked the question 
in the first place.  I really feel like I must be missing something obvious.

Thanks again for your response,

Dave
-- 
Dave McMurtrie, SPE
Email Systems Team Leader
Carnegie Mellon University,
Computing Services

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