State Specification
* Fire suppression systems and acoustic noise: When activated, some inert-gas fire-
suppression systems release pressurized gas at high velocity through multiple nozzles in
the data center, generating high levels of acoustic noise. Pneumatic sirens can also
generate high levels of acoustic noise. High levels of acoustic noise can cause vibrations to
the media in the storage system, resulting in I/O errors, performance degradation in the
media, and to some extent damage to the drives. Media noise-level tolerance varies among
different models, designs, capacities, and manufacturers.
The recommended acoustic noise level of 90 dB or less represents the current operating
environment guidelines for which the storage systems are designed and manufactured for
reliable operation when placed 2 meters or more from the source of the noise.
Note: The storage systems and media are not tested for compatibility with fire-
suppression systems or pneumatic sirens. In addition, Hitachi does not
recommend or claim compatibility with any fire-suppression systems or
pneumatic sirens. The customer is responsible for following applicable
regulations.
To prevent I/O errors and damage to the storage system due to high levels of acoustic
noise:
■
Install noise-reducing baffles to mitigate the noise to the media in the storage system.
■
Consult the fire-suppression-system manufacturer about noise-reduction nozzles to
protect the media in the storage system.
■
Locate the storage system as far away as possible from noise sources.
■
If it can be done safely and without risk of personal injury, shut down the storage system
before the noise occurs to prevent data loss due to damage to the media in the storage
system.
DAMAGE TO MEDIA FROM FIRE-SUPPRESSION SYSTEMS OR PNEUMATIC SIRENS
VOIDS THE MEDIA WARRANTY.
Electrical specifications
The Hitachi Virtual Storage Platform E990 (VSP E990) runs on single-phase AC power. The
AC power input for the VSP E990 storage system has a duplex PDU architecture that
enables the equipment installed in the rack to remain powered on if power is removed from
one of the two power distribution panels.
The following tables provide the electrical specifications for the VSP E990 storage system,
including input power and input voltage and frequency requirements.
Electrical specifications
Chapter 3: Specifications
Hitachi Virtual Storage Platform E990 Hardware Reference Guide 36
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