Since the venerable sgd's friday freebies are always windows based, and since i need to test a new setting on the list relay servers, i thought i'd share with some of us that are on the other side of force :) (although scotts tips are always good, no doubt :) <tip type="unix quickies"> Are you 'su'ing to root, but stuff isn't working? Make sure you use the command 'su - root' to load env variables for the user you're su'ing to. Got problems with memory exceptions and other bad memory problems with solaris 7(2.7) and below? Upgrade to Solaris 8. All of those ebay crashes we heard about last spring are due to some memory bugs in solaris 7. Version 8 fixes most of these, along with a number of other issues. If you're running a server that deals with large files, don't use a standard linux filesystem! By default, the ext2 FS reads and writes in 1024 byte chunks. This is nice for small files, but will kill performance(the end all be all :) when you're dealing with large files on DB, email, proxy, and web servers. Instead, have your FS write in 4096 byte chunks with the command mke2fs -b 4096 /dev/sda1 (for example). You'll see an incredible amount of performance in your disk I/O subsystem, which is *the* most common place for bottlenecks on servers. If possible, recompile your linux kernel to *not* include loadable modules. And compile out the ones that you dont use. This will also increase performance.(Do you really need a USB module on your webserver?) On AIX, Lsdev -Cc <device> will list the available items, what address they are at, the bus slot, and what name the system gave them. </tip> .djc.