Having 32 GB of RAM doesn't automatically necessitate 64-bit processors. Unless your application is specifically designed to use 64-bit instructions, the extra 32 bits does nothing. And I can tell you that the Qmail toaster packages DO NOT take advantage of 64-bit processors with the possible exception of a 64-bit installation of MySQL Server. And even then, your real resource tax is the nasty filtering software.
Qmail doesn't acknowledge an incoming e-mail was actually received until after it places it in the queue, which does not happen until ClamAV and SpamAssassin are done doing their jobs. If you're going to spend real money on an infrastructure, your better severed not trying to load balance a bunch of qmail toasters but actually try and host spamassassin and clamav externally. Use a back channel network (separate Ethernet interface with RFC 1918 addresses) and then configure spamc and clamav clients to connect to spamd/clamd running on physically separate machines. They SHOULD be able to return those messages back to your incoming SMTP servers. Another thing to do would be to also have a separate SMTP server dedicated to your own users (perhaps a xen instance, if you have the processing power to spare). It would have port 25 turned off, and JUST 587 turned on. This way, on your public SMTP server(s), you can switch your /var/qmail/control/blacklists hostname to Spamhaus' "zen" database, and drastically reduce the amount of filtering your spam filters have to do by just refusing the SMTP connections out right. Finally, consider moving IMAP4 to its own machine. A lot of this is going to require some experience with customizing the configuration of the software packages. Things like vpopmail are going to need to be tweaked to connect to a remote host for reading MySQL vpopmail database. I encourage a lot of testing if trying to set all this up. regards, Dairenn Lombard Unix Systems Administrator BroadSpire 617 West 7th Street, Suite 601, LA, CA 90017 Phone: 213.986.1051 | Fax: 213.688.7791 | NOC: 888.262.6161x2 Web Ecosystem Marketing www.BroadSpire.com -----Original Message----- From: Edwin Casimero [mailto:[EMAIL PROTECTED] Sent: Tuesday, December 02, 2008 5:13 PM To: [email protected] Subject: Re: [qmailtoaster] Can QMailToaster Handle 10,000 email addresses? Thank you for all the advices. This is the offer of the data center: 10TB SAN (storage area network) 8 core cpu with up to 32gb of memory, gigabit connected to the internet. Will a single install of CentOS 5.x 32-bit be enough to handle 10,000 email addresses? Or do I need 64-bit CentOS to be able to handle 32GB of memory? Or do I still need a clustered qmailtoaster for the front end? Which I do not know how to do. Is there a link how to do a clustered qmailtoaster? --------------------------------------------------------------------- QmailToaster hosted by: VR Hosted <http://www.vr.org> --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- QmailToaster hosted by: VR Hosted <http://www.vr.org> --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
