[horde] Fwd: Re: Fwd: Re: Server's HDD max capacity

[Andy Dorman]

On 02/01/2017 03:33 AM, Deokgon Kim wrote:
>
> -------- 전달된 메시지 --------
> 제목:     Re: [horde] Fwd: Re: Server's HDD max capacity
> 날짜:     Wed, 1 Feb 2017 08:42:35 +0000 (UTC)
> 보낸 사람:     haider al-shook <prince_of_the_paradise at yahoo.com>
> 받는 사람:     Deokgon Kim <dgkim at dgkim.net>
>
>
>
> If have a server with the following specifications:
> CPU 3.1GHz Quad core intel xeon L3= 8 mb cache
> and suppose the ram is 8 or 16 GB
> How many concurrent users it can serve using horde/imp webmail service
> software?
>
> Sent from Yahoo Mail for iPhone <https://yho.com/footer0>
>
> On Wednesday, February 1, 2017, 11:02 AM, Deokgon Kim <dgkim at dgkim.net>
> wrote:
>
>
>    -------- 전달된 메시지 --------
>    제목:     Re: [horde] Server's HDD max capacity
>    날짜:     Wed, 1 Feb 2017 07:26:09 +0000 (UTC)
>    보낸 사람:     haider al-shook <prince_of_the_paradise at yahoo.com
>    <javascript:return>>
>    받는 사람:     Deokgon Kim <dgkim at dgkim.net <javascript:return>>
>
>
>
>    I am estimating the storage of 800 mail users and allocating 15 GB for
>    each user?
>
>
>    Sent from Yahoo Mail for iPhone <https://yho.com/footer0>
>
>    On Wednesday, February 1, 2017, 10:14 AM, Deokgon Kim
>    <dgkim at dgkim.net <javascript:return>>
>    wrote:
>
>         2017년 02월 01일 15:36에 haider al-shook 이(가) 쓴 글:
>
>         > If i had a server and a centos os (x86_64) installed on it, and i
>         installed 12 TB HDD(s) in the server can the system sees the 12 TB
>         or only 2 TB or what?
>         > Thanks
>         > Sent from my iPhone
>
>         And what is to do with 'horde'?
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>    <javascript:return>
>         <javascript:return>
>
>
>    I assume You are planning a mail service for 800 users.
>    and it is necessary to limit disk usage on a user (about 15GB per user).
>
>    The 'quota' service is provided by mail software or operating system.
>    It is not provided by HORDE or IMP(webmail).
>    (And if you do not configure 'quota', then user have no limit on
>    disk usage)
>
>    If so, you must configure the mail backend program(ex. dovecot,
>    cyrus-imap),
>    Horde/IMP is utilizing the IMAP Quota information provided by the
>    backend.
>
>    So, you must configure the mail software first.
>    If it is dovecot, then check
>    https://wiki2.dovecot.org/Quota/Configuration
>
>
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>

First, don't top post.

Second, the answer is: It depends on so many other factors that no one 
can give you an accurate answer. Some (not all) of the factors include:

- what else is running on the server?  Is this server going to be 
handling ONLY Horde webmail while IMAP and SMTP will be on another 
server?  Or will everything be running on this single server?
- If everything is on the same server then what IMAP & SMTP server will 
you use and how much email traffic will you be handling?
- what http server will you be using? (nginx is way more efficient than 
apache)
- what does your hard disc set up look like and what is the speed of the 
individual HDs?  Is it RAID and if so, then which, 1, 5, 10, or what?

Honestly, your HD/RAID speed is probably going to be the first issue you 
have as your load increases.  Every email that is read will require 
several HD accesses and if this server is handling IMAP and SMTP then 
the demands on your HD infrastructure increase a lot more.

And I forgot to mention spam/AV filtering...if this server is handling 
that too then the rate of incoming email can hit you much harder than 
you would normally expect. Spam/AV filtering is a HUGE load on both 
CPU/RAM and HD.

Good luck!

-- 
Andy Dorman