Esd; Enclosure Cooling; Host Connectivity - Western Digital Ultrastar Data60 User Manual

User Guide
Caution: The Ultrastar Data60 can only be plugged into high line (220-240 VAC). If the unit is
plugged into low line (110-127 VAC), the PSU will report a "Critical" state when status pages
are queried using SES. In this case, the enclosure will power up, but the drives will not. The
enclosure will remain in low-power mode.
1.10 ESD
The enclosure is designed to dissipate all electrostatic discharge (ESD) to the chassis base. Ensure that
there is sufficient electrical and mechanical connection from the chassis base to the rack rails, and that the
rack itself is tied to earth ground. Precautions must be taken to ensure that the system is not exposed to
ESD while handling components or servicing the unit.
The unit must be grounded in accordance with all local/regional and national electrical codes.
1.11 Enclosure Cooling
The Ultrastar Data60 has an advanced thermal algorithm running within the logical enclosure services
process called the SEP that monitors all of the temperature sensors in the enclosure. The SEP makes
adjustments to the fan speeds based upon the thermal sensors. The fan algorithm takes into account the
component and the warning and critical threshold limits defaulted and managed by the SEP controller. If
any temperature sensor exceeds the temperature threshold configured in the SES pages, the fan speed
will increase to cool the enclosure. If the enclosure encounters low temperatures, the enclosure will reduce
fan speed in an attempt to conserve power and not over-cool the enclosure. This algorithm is agnostic
to effects of altitude and humidity. The algorithm works based on temperatures within the enclosure with
emphasis on reducing power consumption.
The rack that the Ultrastar Data60 is installed in must not restrict airflow to the enclosure. Racks with doors
should be tested to ensure they do not constrict airflow to the enclosure. If the enclosure reaches critical
temperature, it will go into low-power mode to avoid damage to the enclosure.
When the Ultrastar Data60 is extended out of the rack, the cover of the enclosure remains inside the rack
which exposes the drives. This feature allows for easier access to drives and simplifies maintenance tasks
related to internal components. However, there is a limit to the amount of time the enclosure can be
extended out of the rack before the enclosure will begin to overheat.
Attention: Limit the amount of time that the enclosure is extended out of the rack to only
what is necessary to exchange a component or perform regular maintenance and should be
limited to a maximum of 5 minutes total. Never extend the enclosure out for longer than 5
minutes to prevent overheating. Only extend the enclosure out of the rack as far as necessary
to service components. The enclosure is equipped with a sensor that will be tripped when
the enclosure's top cover has been opened resulting in the rear fans increasing to max speed.
In the event that a fan has failed, it must be replaced before any other CRUs and should be
removed from the enclosure within 30 seconds of removing the enclosure cover.
1.12 Host Connectivity
The Ultrastar Data60 can use passive cables that are limited to 3m or less, or active cables of any length
for SAS connections to the host. Active cables must be used for Ultrastar Data60 to Ultrastar Data60 daisy
chaining connections. All approved passive and active SAS cables are listed in the following table.
1. Overview

1.10 ESD

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