On 11/08/10 2:16 PM, nux at nux.ro wrote: > 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). indeed. if half those 1000s of users do the typical lUser thing of checking their mail every minute, thats going to be a LOT of forks.