Hitachi G1500 Hardware Manual page 21

Example 1: A new cache flash memory battery has three years of usable life when
operated in a standard temperature environment. If you enable high temperature mode
when the battery is new, the battery life will be reduced to two years.
Example 2: The storage system is used for two years at normal temperature mode. The
cache battery has one year of usable life remaining at that time. If you enable high
temperature mode, the life of the battery is reduced to eight months.
Cache flash memory battery date
When high temperature mode is enabled, the battery replacement notice displays one
year earlier than when high temperature mode is disabled.
After high temperature mode is enabled, the date of the battery replacement notice
cannot be changed back to normal, even if high temperature mode is disabled. When
high temperature mode is enabled, a confirmation message appears.
Caution: Important information about using high temperature mode.
See the System Administrator Guide for additional information.
Notify Technical Support: Before enabling high temperature mode,
■
contact Hitachi Vantara Support at
us.html for updates or additional information besides the following notes.
Guidelines for operating with flash module drives in high
■
temperature mode:
Do not enable high temperature mode if the system contains flash
●
module drives (FMDs) from an earlier generation (prior to Hitachi
Accelerated Flash FMD DC2 drives). The early generation FMDs cannot
operate in high temperature mode. Only enable high temperature
mode with Hitachi Accelerated Flash FMD DC2 drives.
Do not enable high temperature mode if the system contains a
●
combination of early and current generation FMDs.
Operating altitude: Because thinner air does not provide sufficient
■
cooling, do not enable high temperature mode if the system is located
above 4920 ft / 1,500 m above sea level. A storage system can operate up
to 9842 ft / 3,000 m above sea level in standard temperature mode.
System noise: When the storage system is used in a high temperature
■
environment near 104°F / 40°C, the fans operate at high speed, increasing
system noise. See
information.
Temperature measurement
Ambient air temperature is measured by a sensor in the cooling air inlet on each module
in the primary VSD pair on each controller.
Chapter 1: VSP G1000, VSP G1500, and VSP F1500 overview
Hitachi Virtual Storage Platform G1000, G1500, and VSP F1500 Hardware Guide
https://support.hds.com/en_us/contact-
Environmental specifications (on page 143)
High temperature mode
for detailed
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