User Guide
1. Overview
1.16 SAS Cabling
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.
1.16
SAS Cabling
The Ultrastar Data60 can use passive cables up to 3m in length, or active cables up to 10m, 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.
Note: MegaRAID adapters do not support the use of active SAS cables. If your configuration
requires the use of MegaRAID adapters, passive cables must be used.
Table 21: Approved SAS Cables
Type Length Manufacturer Vendor Part Number
Amphenol ICC (FCI) FOHHB23P00003
5
3m
Molex 106415-2103
Active Optical
HD Mini-SAS to HD Mini-SAS
4
4m Amphenol ICC (FCI) FOHHB23P00004
5. Listed FOHHB23P00xxx cables are compatible, beginning with FW 2052-003.
4. Active cables can be used for both direct (host-to-enclosure) and daisy-chain (enclosure-to-enclosure) connections.
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