----- Original Message ----- From: "Juergen Georgi" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, February 06, 2004 8:42 AM Subject: Re: [Mimedefang] Looking for more ramdisk benefits
> > I moved /var/spool/MIMEDefang to a ramdisk and got a 20% improvement in > > scan time (It's a slow old disk in the box) > > Before I spend ages experimenting, has anybody found any worthwhile > > improvement by moving other stuff to ramdisk, [...] > > Bayes db lookups hit the disk on every message. I'm thinking about > moving bayes_path entirely to a tmpfs. Of course there must be > a mechanism to save the precious bayes data across reboots - maybe > with one or two snapshot backups per day to persistant storage. > > Has anyone done this before? Yes, I have done this and it's incredibly helpful on a higher-volume system. You should at least write scripts that do roughly: 1) At system boot: - Mount the tmpfs - Copy the backup bayes database to the tmpfs 2) At system shutdown: - Copy the bayes database to the backup location - Dismount the tmpfs If you lose a few days (or, often, a few weeks!) of Bayes database it's not a problem. Losing a few months, or all of it, would generally be considered "bad". Do make sure you have enough RAM to keep everything from swapping and paging. The moment a system starts swapping and paging, performance will drop in the the toilet. I probably wouldn't even consider this trick with less than 512MB of RAM (and preferably 1GB). Chris Myers Networks By Design _______________________________________________ Visit http://www.mimedefang.org and http://www.canit.ca MIMEDefang mailing list [EMAIL PROTECTED] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
