Mounting In The Server Rack

The mounting in your server rack used to be done by tapped holes and threaded bolts

. As IT technology became more rapidly obsolescent, though, the practice of tapping in threaded bolts was replaced by one less likely to be damaged with frequent changing.

Where the threaded bolt would erode and eventually shear over months of repeated insertion and taking out, the modern server rack fixing in either end is using a clearance hole setup or by using square holes that dont require bolts at all.

The clearance hole method of fixing involves bolting the unit on using cage nuts rather than screws. A cage nut is a bolt that passes through a hole with no turning, and is then held in place with a spring steel arrangement that clips onto the front of the server rack.

The square hole method is bolt free allowing the ear-flaps of the rack to be inserted through the hole and dropped down. The weight of the rack itself then holds the whole unit in place.

The stress points on older server racks were all at the front where the equipment was fastened. Modern racks have adjustable rails to hold servers and other items of communications or diagnostic hardware in place, allowing a weight bearing point to be introduced to the back of the server even when it is not as deep as the server rack itself. This reduces the risk of servers shearing off their metal ear-flaps and dropping onto the unit mounted below them.

In actual fact, the rails are mounted in the racking system, and the unit is mounted on the rails so while it appears that the server unit is bolted fixedly into the server rack, it may be slid out on rails for quick access and easy maintenance. This has become an increasingly important property of rack mount systems as communications and IT tech gets more and more complicated. Network engineers are routinely called upon to isolate a fault in a complicated web of relationships by removing one part of the equation at a time until the problem becomes clear. Server racks with mounted adjustable sliding rails make this process much easier and quicker.

They also make it safer, as the sliding rail continues to take the weight of the server unit even when the item is extended out of the cabinet. The load bearing shifts out with the rail, so a single network engineer may safely work under a rack that has been pulled out without worrying that the shearing forces of unequal load distribution will wrench the thing out onto his head.

Servers in such a modern server rack may make use of mirrored LED displays at both ends so an engineer can get at the rack from whichever location is best suited to the layout of the data room.

by: keyzone computer

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