Sun StorageTek SL8500 Modular Library System
 

PLA-Support>Sun Systems>TAPE>Tape Hardware>SN-TP: SL3000-8500 Library
 

Applies to:

Goal

Air Flow Requirements for the SL8500 Library.

Fix

Steps to Follow
The airflow in the SL8500 is from the front library perforated doors. The drive tray fans pull air front to back through rear library perforated doors.


For the specifics on air flow requirement reference page_80 in the Systems Assurance Guide.

The air flow required to cool the SL8500 depends on the total number of components installed within it, such as tape drives, load sharing DC power supplies, and accessory racks.

Each of these components contribute to the total airflow required.

Calculations (requirements) for these individual components—using standard air conditions at sea level (pressure) and 22 degrees C / 72 degrees F (temperature)—are:
A maximum configured library with 64 tape drives, 24 DC power supplies, four rack modules, and the electronic control module would require:
112.0m3/min. (3956 ft3/min.) of supply air to avoid recirculation.
Most configurations are smaller than this and require less air flow.
An example of a smaller configuration is 12 tape drives split between drive bays for redundancy, one robot on each level, one rack module, and the electronic control module.
This would require 33.30m3/min. (1176 ft3/min.).
The layout of the data center should account for the cooling requirements of SL8500 as well as other equipment in the center—possibly through the concept of having a cool aisle and hot aisle in accordance with environmental best practices and controls.

Table 40.  Air Flow Requirements
Component                                           Measurement                                                  Quantity
Tape drive                            0.57m3/min. (20 ft3/min.) each                             64 possible
DC power supply                   0.71m3/min. (25 ft3/min.) each                             24 possible
Rack Modules                     13.59m3/min. (480 ft3/min.) each                             4 possible
Electronics Module                 4.42m3/min. (156ft3/min.)

A maximum configured library with 64 tape drives, 24 DC power supplies, four rack modules, and the electronic control module would require:
112.0m3/min. (3956 ft3/min.) of supply air to avoid recirculation.

Most configurations are smaller than this and require less air flow.
An example of a smaller configuration is 12 tape drives split between drive bays for redundancy, one robot on each level, one rack module, and the electronic control module.
This would require 33.30m3/min. (1176 ft3/min.).

The layout of the data center should account for the cooling requirements of SL8500 as well as other equipment in the center—possibly through the concept of having a cool aisle and hot aisle in accordance with environmental best practices and controls.

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