[horde] still having problems with dropped sessions

dhottinger at harrisonburg.k12.va.us dhottinger at harrisonburg.k12.va.us
Wed Mar 14 23:50:35 UTC 2007

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

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