What rack sizes are available? They are available in different sizes from 1U to full racks (42U) and beyond. Important: U describes height only, but a server's real "capabilities" are also determined by chassis depth, internal layout, airflow, rails, power, and expansion (PCIe/risers, NVMe. A rack unit, abbreviated as U (or RU), is a standardized unit of measurement used to describe the vertical space occupied by equipment in a server rack. For example, a typical full-size rack cage is 42U high, while equipment is typically 1U, 2U, 3U, or 4U high. The rack unit size is based on a standard rack specification as defined in EIA -310. Most professional server racks follow the EIA-310 standard, which defines: These standards make it possible for any 19-inch compatible device to fit securely within the rack, regardless of brand.
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