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Unlike a rack-mount server, a blade server fits inside a blade enclosure, which can hold multiple blade servers, providing services such as power, cooling, networking, various interconnects and management. Together, blades and the blade enclosure form a blade system, which may itself be rack-mounted.
A ½ height blade means that you can fit up to 16 of those servers in one M1000e enclosure. The M520 and M620 can also be used in the new PowerEdge VRTX system. The new M420 is 1/4 height, so 32 fit in a M1000e chassis but does require a special full height holder that fits 4 M420's in one full-height (=double) slot.
Newer server rack cabinets come with adjustable mounting rails allowing the user to place the rails at a shorter depth if needed. There are a multitude of specialty server racks including soundproof server racks, air-conditioned server racks, NEMA-rated, seismic-rated, open frame, narrow, and even miniature 19-inch racks for smaller applications.
PowerEdge M1000e - the Dell blade-server system where the complete system uses the term PowerEdge, and M1000e refers to the chassis and the complete combination of components in them. The individual non-server components have also their own name in their 'own' family such as PowerConnect M-switches or EqualLogic blade-SAN.
A blade enclosure offers centralized management for the servers and I/O systems of the blade-system. Most servers used in the blade-system offer an iDRAC card and one can connect to each servers iDRAC via the M1000e management system. It is also possible to connect a virtual KVM switch to have access to the main-console of each installed server.
The VRTX system is partially based on the Dell M1000e blade-enclosure and shares some technologies and components. There are also some differences with that system. The M1000e can support an EqualLogic storage area network that connects the servers to the storage via iSCSI, while the VRTX uses a shared PowerEdge RAID Controller (6Gbit PERC8).