[horde] still having problems with dropped sessions

[dhottinger at harrisonburg.k12.va.us]

Quoting Kevin Konowalec <webadmin at ualberta.ca>:

> Horde: 3.1.2
> Imp: H3 (4.1.2)
> Turba: H3 (2.1.1)
> PHP Version: 4.4.1
>
> So I've added a second memcached instance of 512MB (for a total of
> 1024MB) but we're still seeing sessions being dropped fairly
> frequently (and no messages in the logs are even remotely helpful).
> By "dropped" I mean the user will be logged in and reading or writing
> mail and suddenly he/she will find themselves booted back to the
> login screen without explanation.  We have roughly 3600-4000
> concurrent users at peak volume - is 1Gig enough memcached size?  And
> if it's not a memcached problem, where else can anyone suggest we
> look as the cause?  Since this is the busiest time of the year I
> suspect that it's a function of load... but I'm not sure which part
> of the system is failing because of it.  And it's strange in that
> sometimes you can leave yourself logged in all night and your session
> will still be there (as you'd expect) but other times you can be
> booted out several times repeatedly without warning.
>
> I'm not sure if it's an indicator of the way students use the system
> (ie logging in to check their mail several times a day) or if it's a
> result of this repeated login problem but my log analysis showed that
> the number of distinct users logging in per day is dwarfed by the
> total number of logins per day at a ratio of about 3:1 and growing.
>
>
>
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I have a similiar setup and have noticed some of the same although not  
on the same ration.  What version of php and what imap software are  
you using?

-- 
Dwayne Hottinger
Network Administrator
Harrisonburg City Public Schools