I was hit by a rather large electricity bill recently (at home). My current cluster set up comprises 2 x HP Proliant DL380 G3s and an MSA 500 storage array (all three are very heavy on the juice!). I decided that if I want to continue playing with RHCS at home I needed to look for a cheaper, greener option. I can easily get a couple of PC's (dual or quad core cpus and plenty of RAM for running a virtualised cluster) but the stumbling block has been a cheap low power shared storage solution. The best that I have come up with so far is an offering from Maxtor and from LaCie, which basically comprises an esata disk enclosure that has two firewire 800 ports. I believe that Linux will support these dual firewire 800 enclosures but I am a little concerned about the speed (91MB/s) in comparison to a SCSI disk array. Ideally, I would prefer a disk enclosure / array with dual esata ports but I haven't been able to find anything.
My question is, does anybody have a low cost hardware specification that they are running xen and RHCS on with shared storage that won't cost the earth and won't hit me in the wallet when it comes to paying the electricity bill?