Re: Very huge email service
On Tue, 23 Nov 1999, Jeremy C. Reed wrote:
>Interesting comments. Below I have added my observations...
>
>> On Tue, 23 Nov 1999, Baltazar Quinterno wrote:
>> >Does anyone had to configure mail servers to serve 30 millon users,
>
>On Tue, 23 Nov 1999, Russell Coker wrote:
>> Let's start by doing some maths. Assume that an average user checks their
>> email through a single POP connection once a day. Some users check their
>> email every 5 minutes for several hours a day, some only once a week or less.
>> Anyway if it's 30M POP connections per day then it's:
>> 30,000,000/24/60/60 = 347 POP connections per second.
>
>My system has 7200 accounts and 4905 mailboxes. If I approximate that I
>have 5000 pop users, I'd have to multiply my figures my 6000 to reach
>30,000,000. (My system averaged 189,447 good pop3 connections per week for
>the last four weeks.)
>
> 1,136,682,000 pop3 connections per week
> 162383142.85 per day
> 6765964.29 per hour
> 112766.07 per minute
> 1879.43 per second
That's quite a bit higher than I had expected. I hope and expect that
multiplying the user-base by 6000 will not multiply the frequency of checking
email by 6000. I expect that when you get to 30M users a large proportion of
them will not check their mail more than once ever 2 weeks.
My estimates all count on a large proportion of the user-base not being very
active at all...
>> Now calculate storage. If each email on average sits on your server for a
>> day before being collected (the users who get the most mail check their mail
>> most often) and the average is 30K/day then the disk space requirements is:
>>
>> 30M*30K = 900GB
>
>If I multiplied my current mail spool (by 6000) it would have about
>7,717,350,000 KB of data.
Again I hope for the sake of our Argentinian friend that it doesn't scale in
such a way. 8TB of data is almost unmanagable outside of a mainframe at the
moment.
Perhaps it would be best if Baltazar could post some stats on average mail
storage sizes etc for the current user base. It may give a more accurate
indication of what 30M of the same type of user will do than our guesses.
--
Electronic information tampers with your soul.
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