[CentOS] Centos 7 and RAM

[Kenneth Porter]

--On Monday, July 16, 2018 8:41 PM -0400 Jay Hart <jhart at kevla.org> wrote:

> L, The use of this machine would be as a home server running as a web and
> email server, two users, light use.  My current server has 4GB, but I'm
> thinking of getting a new box and if I can afford it, figured I'd get
> 16GB vice 8.

Email per se doesn't use much in the way of resources. But my server is 
running MIMEDefang (a Perl-based mail filter), SpamAssasin, and ClamAV. 
Those can chew up memory to do their analysis. You'll probably run a local 
DNS server for those scanners and that will start to use memory.

If you're an email packrat like me, big email folders can chew up resources 
when Dovecot (the IMAP server) serves them.

I'm also running MariaDB, Apache, and node.JS for various projects and 
those eat memory.

Perhaps my biggest sink is BackupPC to back up my household workstations 
using rsync child processes. rsync is notorious for eating tons of memory 
to hold a copy of your directory metadata for difference analysis (to 
generate incrmental backups).