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Field Replaceable Units
Jan 28 , 2011
Citrix NetScaler field replaceable units (FRU) are NetScaler components that can be quickly and easily removed from the
appliance and replaced by the user or a technician at the user's site. The FRUs in a NetScaler appliance can include DC or AC
power supplies, and solid-state or hard-disk drives, and a direct attach cable (DAC).
Note: The solid-state or hard-disk drive stores your configuration information, which has to be restored from a backup
after replacing the unit.
This section includes the following topics:
Power Supply
Solid-State Drive
Hard Disk Drive
Direct Attach Cable
For appliances containing two power supplies, the second power supply acts as a backup. The SDX
22040/22060/22080/22100/22120 and SDX 24100/24150 appliances can accommodate four power supplies, and require
two power supplies for proper operation. The third and fourth power supplies act as backup.
The appliance ships with a standard power cord that plugs into the appliance’s power supply and an NEMA 5-15 plug on the
other end for connecting to the power outlet on the rack or in the wall.
For power-supply specifications, see "Hardware Platforms," which describes the various platforms and includes a table
summarizing the hardware specifications.
Note: If you suspect that a power-supply fan is not working, please see the description of your platform. On some
platforms, what appears to be the fan does not turn, and the actual fan turns only when necessary.
On each power supply, a bicolor LED indicator shows the condition of the power supply.
Electrical Saf ety Electrical Saf ety Precautions for Power Supply ReplacementPrecautions for Power Supply Replacement
Make sure that the appliance has a direct physical connection to earth ground during normal use. When installing or
repairing an appliance, always connect the ground circuit first and disconnect it last.
Always unplug any appliance before performing repairs or upgrades.
Never touch a power supply when the power cord is plugged in. As long as the power cord is plugged in, line voltages are
present in the power supply even if the power switch is turned off.
Replacing an AC Power Supply
Citrix NetScaler SDX platforms can accommodate two power supplies, except the SDX 22040/22060/22080/22100/22120
and SDX 24100/24150 platforms which can accommodate four power supplies. All NetScaler appliances function properly
with a single power supply, except the SDX 22040/22060/22080/22100/22120 and SDX 24100/24150 platforms which
need two power supplies for proper operation. The other power supplies serves as a backup. All power supplies must be of
the same type (AC or DC).
Note: If the appliance has only one power supply, you have to shut down the appliance before replacing the power supply.
If the appliance has two power supplies, you can replace one power supply without shutting down the appliance, provided
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