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Tks.<br />
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For a server for 4u, I can simply it occupy 12 holes. Do I need to calcuate additional space for web mount kit ?
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Tks.

For a server for 4u, I can simply it occupy 12 holes. Do I need to calcuate additional space for web mount kit ?

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By &quot;web mount kit&quot;, do you mean &quot;rack mount kit&quot;? A rack mount kit usually does not take any additional space.<br />
When choosing your rack, it is best to allow plenty of additional RU''s to allow for cable tidies and future expansion.
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By "web mount kit", do you mean "rack mount kit"? A rack mount kit usually does not take any additional space.
When choosing your rack, it is best to allow plenty of additional RU''s to allow for cable tidies and future expansion.

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What's the distance between 2 holes in server rack ? Does it measure from the centre of one hole to anothers ? <br />
<br />
For a server rack of 2U, how many holes does it occupy ?
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What's the distance between 2 holes in server rack ? Does it measure from the centre of one hole to anothers ? 

For a server rack of 2U, how many holes does it occupy ?

Server Rack

Servers are computing devices that are similar to desktop computers in that they have the same basic components, but are significantly different in size, configuration and purpose. Servers are usually accessed over a network, and many run unattended, without a computer monitor, input device, audio hardware or USB interfaces. Many servers do not have a graphical user interface (GUI), and are configured and managed remotely. Servers typically include hardware redundancy such as dual power supplies, RAID disk systems, and ECC memory, along with extensive pre-boot memory testing and verification. Critical components might be hot swappable, and to guard against overheating, servers might have more powerful fans or use water cooling.

Server Hardware

Components are those devices that are internal to a computer -- the PC boards, the central processor (CPU), the memory (RAM), disk and video controllers and so on.

Components

Hardware includes cell phones and other digital living devices, tablets, computers, servers, peripherals and components, printers and scanners, gaming consoles, networking hardware such as routers, hubs, switches and modems, storage devices and security equipment such as firewalls and other appliances.