Environmental requirements

Before you install a or Storwize® V7000 Gen2+ system, your physical environment must meet certain requirements. This includes verifying that adequate space is available and that requirements for power and environmental conditions are met.

Safety notices

Use the following general safety information for all rack-mounted devices:

DANGER
Observe the following precautions when working on or around your IT rack system:
  • Heavy equipment–personal injury or equipment damage might result if mishandled.
  • Always lower the leveling pads on the rack cabinet.
  • Always install stabilizer brackets on the rack cabinet.
  • To avoid hazardous conditions due to uneven mechanical loading, always install the heaviest devices in the bottom of the rack cabinet. Always install servers and optional devices starting from the bottom of the rack cabinet.
  • Rack-mounted devices are not to be used as shelves or work spaces. Do not place objects on top of rack-mounted devices.
    An unstable rack with a shelf with an object on it
  • Each rack cabinet might have more than one power cord. Be sure to disconnect all power cords in the rack cabinet when directed to disconnect power during servicing.
  • Connect all devices installed in a rack cabinet to power devices installed in the same rack cabinet. Do not plug a power cord from a device installed in one rack cabinet into a power device installed in a different rack cabinet.
  • An electrical outlet that is not correctly wired could place hazardous voltage on the metal parts of the system or the devices that attach to the system. It is the responsibility of the customer to ensure that the outlet is correctly wired and grounded to prevent an electrical shock. (R001 part 1 of 2)
CAUTION:
  • Do not install a unit in a rack where the internal rack ambient temperatures will exceed the manufacturer's recommended ambient temperature for all your rack-mounted devices.
  • Do not install a unit in a rack where the air flow is compromised. Ensure that air flow is not blocked or reduced on any side, front, or back of a unit used for air flow through the unit.
  • Consideration should be given to the connection of the equipment to the supply circuit so that overloading of the circuits does not compromise the supply wiring or overcurrent protection. To provide the correct power connection to a rack, refer to the rating labels located on the equipment in the rack to determine the total power requirement of the supply circuit.
  • (For sliding drawers) Do not pull out or install any drawer or feature if the rack stabilizer brackets are not attached to the rack. Do not pull out more than one drawer at a time. The rack might become unstable if you pull out more than one drawer at a time.
  • (For fixed drawers) This drawer is a fixed drawer and must not be moved for servicing unless specified by the manufacturer. Attempting to move the drawer partially or completely out of the rack might cause the rack to become unstable or cause the drawer to fall out of the rack. (R001 part 2 of 2)
Important: In addition, remember:
  • The rack design must support the total weight of the installed enclosures and incorporate stabilizing features suitable to prevent the rack from tipping or being pushed over during installation or normal use.
  • The rack design must consider the maximum enclosure operating ambient temperature of 35-degrees C (95-degrees Fahrenheit).
  • The rack must have a safe electrical distribution system. It must provide overcurrent protection for the enclosure and must not be overloaded by the total number of enclosures installed. The electrical power consumption rating that is shown on the nameplate should be observed.
  • The electrical distribution system must provide a reliable ground for each enclosure in the rack.

Power requirements for each power supply

The power that is used by the system depends on various factors, including the number of enclosures and drives in the system and the ambient temperature. Ensure that your environment meets the following power requirements for each of the two power supply units (PSUs) in the enclosure.

Each control enclosure contains two PSUs for redundancy. The total power consumption values represent the total power that is drawn by both PSUs.

The power and thermal measurements were obtained in the specific operating environment and under the conditions described. These measurements are presented as an illustration; measurements that are obtained in other operating environments might vary. Conduct your own testing to determine specific measurements for your environment.

Each control enclosure contains two PSUs for redundancy. The total power consumption values represent the total power that is drawn by both PSUs.

Environmental requirements

System airflow is from the front to the rear of each 5U expansion enclosure:
  • Airflow passes between drive carriers and through each enclosure.
  • The combined power and cooling module exhausts air from the rear of each canister.

Dimensions and weight

Ensure that space is available in a rack, capable of supporting the enclosure based on the data shown in .

Attention: To avoid potential equipment damage during transport and subsequent loss of data, see Procedure: Transporting a 5U 92-drive expansion enclosure. The procedure describes what to do for the following situations.
  • When you are powering off a 92F, 92G, or an A9F 5U expansion enclosure because you intend to transport it to another location
  • When you intend to move a rack that contains a 92F, 92G, or an A9F 5U expansion enclosure
The procedure describes how to remove each drive from the 5U enclosure and transport the enclosure. Removing the drives prevents damage to the drives and makes the lighter enclosure easier to move.
Warning: The 5U expansion enclosure needs 968 mm from the rack front post to the back of the cable management arm (CMA). Some racks do not provide sufficient space to close the rear door. In addition, allow 905 mm from the front post to the back of the enclosure. To allow space for the power cables, provide 60 to 70 mm from the back of the enclosure.
Figure 1 shows the rack space requirements for 5U expansion enclosures.
Figure 1. Rack space requirements for 5U expansion enclosures
Rack space requirements for the 5U expansion enclosure

Additional space requirements

Ensure that these additional space requirements, as shown in Table 1, are available around the enclosures.

Table 1. Clearances
Location Additional space requirements Reason
Left and right sides 50 mm (2 in.) Cooling air flow
Back Minimum: 100 mm (4 in.) (This is not needed for 5U expansion enclosure.) Cable exit

Supported drives

Acoustical specifications for SAS drives for each control enclosure

The noise emission level that is stated is the declared (upper limit) sound power level, in decibels, for a random sample of machines. All measurements are made in accordance with ISO 7779 and reported in conformance with ISO 9296.

Shock and vibration specifications for control enclosures

Table 2 and Table 3 provide the shock and vibration testing results for your control enclosure.

Table 2. Shock testing results
Shock categories Test level Performance
Operational 5 g 10 ms 1/2 Sine <= 25 g 10 ms
Non-operational 30 g 10 ms 1/2 Sine <= 75 g 11 ms
Table 3. Vibration testing results
Vibration categories Test level Performance
Operational 0.21 grms 5-500 Hz Random Throughput loss < = 10% FCAL < = 0.68 grms
Non-operational 1.04 grms 2-200 Hz Random <= 3.12 grms
Shipping 0.3 g 2-200 Hz Sine <= 5 g
Rotational vibration Normal operation performance measurements in enclosure with no external vibration. Throughput loss for all drives of the same type within performance profile.