Psu And Battery Care - Hitachi 2000 Series Hardware Reference Manual

When the High-performance NAS Platform is not powered up, or when the PSU is not
installed, the battery will begin to slowly discharge. Periodic recharging is required to
preserve the service life of the battery. Once the battery is completely discharged, failure
to recharge the unit within a couple of days will result in permanent degradation of the
battery service life.
In normal use, the battery life expectancy is limited by chemical processes inherent to
the lithium-ion cells that make up the battery. This loss of capacity is monitored regularly
by the server, and this information is saved in a battery status log. These logs are useful
in concluding the state of the battery.

PSU and Battery Care

Each PSU contains a battery used for NVRAM. To maximize the performance of the
battery, it is necessary to fully charge the battery.
Complete battery discharge can happen if the High-performance NAS Platform is not shut
down correctly, in which case the NVRAM LED will indicate that the NVRAM is still
powered. Verify that the High-performance NAS Platform has been shut down correctly
before powering off. If a proper shut down was not possible and NVRAM does not need to
be preserved, then removal of both PSU modules at the same time, for a few seconds,
will ensure that the NVRAM enters the OFF state and the batteries no longer supply power
to the NVRAM.
Batteries left in a system that has been improperly powered down will drain beyond
usefulness sometime after 72 hours (the NVRAM data retention period). If the battery is
left connected in an improperly shut down system, the battery must be recharged within
30 days.
When preparing a High-performance NAS Platform for shipment or if it is powered down
for any length of time, it is important that the High-performance NAS Platform has been
shut down correctly before powering-off. Otherwise, if the High-performance NAS
Platform is improperly shut down, the batteries supplying the NVRAM will become fully
discharged. This also occurs if the system is powered down for too long without following
the proper procedure.
Note: If the batteries become fully discharged, or the system is to be powered down
for an extended period, see
Shipment or Storage," on page
Center (TRC) for information about recharging PSU batteries.
PSU600 modules are not field serviceable. When the PSU600 battery pack reaches
the end of its useful life, or when the server detects other PSU performance issues, a
Severe event is logged. Contact the appropriate support organization to request prompt
replacement of the PSU. The original PSU should be returned to the repair depot for
service.
PSU610 modules have field replaceable battery packs. Contact Hitachi Data
Systems Technical Resource Center (TRC) to request a replacement battery pack. When
received, follow the instructions below to replace the old battery pack.
Note: Battery pack installation also is required when a replacement PSU610 is
received from the service depot.
To install a new battery pack in a PSU610, you will need a Phillips #1 screwdriver and the
replacement battery pack. To install the new battery pack:
22
"Powering Down the High-performance NAS Platform for
39. Contact Hitachi Data Systems Technical Resource
Hitachi High-performance NAS Platform