[horde] Memcache server questions

[Steve Devine]

Quoting "Kevin Konowalec" <webadmin at ualberta.ca>:

> We found that using mySQL servers for sessions couldn't handle 
> anywhere near the load we have on it.  It could be possible that your 
> memcached pool is too small - how many concurrent users do you 
> usually see?  If you got a flood of new connections it could have 
> overwhelmed your server... depending on how many users you have 4 
> gigs is really not a lot (we're currently running with 8x4GB servers 

Do you mean here that you have 8x4G memcache servers or 8x4Gig Horde imp front ends?

> and once we do an OS upgrade we'll be going with 16GB servers.  We 
> have about 75-80K users seeing about 6000-7000 concurrent connections.
>
> K
>
>
>
> On Nov 12, 2008, at 2:32 PM, Steve Devine wrote:
>
>>
>> We are about a month away from full release of our Horde implementation.
>> Twice we have had hard failures of our session management system.
>> We are using memcache on a separate server. Its a SunX4100 with 
>> 8gigs of available ram, we gave memcached 4Gigs to use and it had 
>> been running fine. Yesterday our Communication manager sent out a 
>> huge mass mailing inviting people to try the system and after an 
>> hour it went right in the tank.
>> We are in the process of getting another machine to run memcached on 
>> line so we can do failover but this whole thing spooks me a bit.
>> I have read many times on this list that memcache is the best way to 
>> handle sessions on a large installation. Is this still the feeling 
>> of the list?
>> One of the problems is when the apache server cannot write the 
>> session it just hangs and the user gets a blank screen. Soon it 
>> seems to cascade out of control and stopping and restarting the 
>> memcache process did not seem to help.
>> If I decide to abandon the memcache server in favor of mysql am I 
>> heading down the same road? Anyone out there with experience in 
>> either of these methods care to comment?
>> Thanks
>> /sd
>>
>> Steve Devine
>> Michigan State University
>>
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>
>
>

  

Steve Devine
Email & Storage
Academic Technical Services
Michigan State University

313 Computer Center
East Lansing, MI 48824-1042
1-517-432-7327