On a brand new computer (HP ProLiant ML370 G3, Dual Xeon 3.2 Ghz CPU, 1024 Mb RAM) this user have fun with Debian Etch and Xen.
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I decided that I did not need file system encryption so I skipped LUKS. I also used my hardware RAID instead of Linux's software RAID. Hardware RAID is simply faster, and with HP's hpasm software I would be able to monitor the RAID from inside Debian anyway. That was the next thing I installed so that I could get my fan speed down. Without HP's software the fans are stuck at “medium” or “high” (BIOS setting) which sounds a bit like an F16 at take-off. HP's software monitors the temperature inside the case and adjusts the fan speed accordingly. Usually that means they will run at low speed and sound much quieter.