Learning about server virtualization by setting up a homelab running off ESXi with used Dell servers like the r510 and r710 and HP servers like the DL360 G7. This is a log of my adventures as a Database BI Developer setting up a homelab pretending to be a sysadmin.
Racks and Rack Holes - The differences and why you care.
I bought a Dell T130 server recently after finding a good deal on it, and if 1 is good, more is better. After looking at some auction websites I found a Dell R510 (R stands for Rack mount, T stands for Tower is the dell server ecosystem) and purchased that as well. Once you start finding server hardware you realize you're probably going to need space to store it for easy access, This brings up Racks. I'm not really a hardware guy, never been a sysadmin from that perspective but all software computer guys have to deal with their own hardware.
I found a good guide describing one of the main differences between racks. Rack Holes.
Racks use rails to mount servers and come with a few different flavors for mounting them, Round Holes, and Square Holes. The following movie talks about the differences and the hardware needed for Dell Rack Systems. Hopefully this helps you decide on what kind of rack you should be looking for on ebay/craigslist if you start branching out into a more robust layout.
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