[JDEV] scaling a single server?

[Russell Nelson]

I've got a customer with 25 lakh users.  In case you're not familiar
with the units they use in India (I wasn't), 1 lakh == 10,000.  They
also comma-ize in an original and inventive manner, so they have
2,50,000 users.  I'm trying to convince them NOT to implement a
proprietary system.  This should not be impossible since they have
developed a predilection to Open Source solutions.

They want to add all 25 lakh users to Jabber all at once, and announce 
it.  Clearly there is not going to be a ramp-up period to give them
time to gain experience with Jabber.  They need to know that it will
scale from the get-go.

Obviously this is OS dependent.  My customer is running Redhat 6.1 on
a machine with 18GB of hard drive and 1GB of memory.  Those values
should not be the constraint.  I'm more concerned with the number of
sockets that can be open at any one time.  If Linux has a limit of
1,000 sockets, and they have (they estimate) 25 thousand users online
at any one time, that means they need 25 servers.  This is double-plus 
ungood.

Does anyone have any experience with how big a single Jabber server
can scale?

-- 
-russ nelson <sig at russnelson.com>  http://russnelson.com
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