[CentOS] large numbers of linux system user for postfix

[nux at li.nux.ro]

ahmad riza h nst writes:

> hello,
> 
> i need to setup a mail server with postfix + dovecot + webmin +
> virtualmin + virtual user with linux system user. the virtual user may
> reach to thousands user from several hundreds virtual domains.
> 
> what i concern is large numbers of linux system user which used in
> these setup, is it good or bad?

The large number of system users should not be a problem. Might have been an 
issue with Linux 2.4 (2^16=65536 max users), but Linux 2.6 can handle a LOT 
(2^32=4294967296)[1].

I'd be more worried of the stress this number of users can inflict on a 
machine (CPU, memory, I/O etc).

[1] - http://en.wikipedia.org/wiki/Linux_kernel

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