How many Raspberry Pis does your setup consist of?
What other equipment and components do you use?
SanDisk 4GB SDHC card (£3.44 delviered, I ordered 5 and cron dd the entire card every day to a network machine. Painless. Cheap.)
A USB keyboard (not plugged in)
An old tft (not hooked up)
What do you use your server setup for?
Basic http serving (lightttpd), irc bot (eggdrop),shell services to mates (bitchx, http etc), mumble server, routing (VPN) and mail (exim). I used the hf Raspbian image initially, but I am unhappy with the lack of a Server Edition so ended up using the installer and building my own base system that way. The whole headless setup weighs in at about 100mb fully optimized for sdcard use, which makes imaging and backups a lot easier. I'll release the image if anyone's interested.
root mounted ordered date mode with ext4 defaults,noatime,commit=3600
Dropbear instead of SSHD
Pruned tty's to 1
The whole thing boots to 33mb of ram and takes it real easy on the SDCARD.
Runs headless 99% of the time.
I wanted to run a true LAMP box and did for a few weeks until it crashed and I had to hard reboot the pi. This usually corrupts the boot vfat or root FS most of the time. The PI's sdcard controller just doesn't seem to be able to handle unscheduled reboots at all. You can mitigate this obviously, but ultimately its just a fact of life that sdcards are not the best option for data integrity.
Fine for routing, vending static content, mail etc. Not so cool for actual long term server use where data integrity is important unless you get a powered hub and hook up a cheap SSD. I haven't done this just yet as I am finding it pretty hard to find a powered hub that uses an efficient wall wart PSU but will eventually.
I will try running MYSQL on a ramfs (since its only vending 1 db for 1 smf install) using innodb. If that works out ok I'll be chuffed to bits. The 1 hr fs flush you can work around by just using a mysql backup script to dump your db every 20 mins to gmail mailbox. Again painles, quick and safe.
Protip: Get a proper 1000ma switching PSU like this one: http://www.amazon.co.uk/Universal-Switc ... B007JIPREK
. Don't use a phone charger!