Non-Volatility - Texas Memory Systems RamSan-120 User Manual

The RamSan-120's power supply connects to an internal battery pack. The
battery pack provides up to seven minutes of operation after a power
failure. You can monitor power supply temperature and voltages from the
system monitoring software.
If a RamSan-120 looses power, it operates for one minute before
beginning to shutdown. The shutdown process involves synchronizing data
to the internal hard disk drive. If the system determines that the battery
life will not last the full shutdown delay period, it will start the
synchronization process immediately.
When power is restored, the RamSan-120 restores system memory with
the data from the internal hard disk drive and then resumes normal
operations. In addition, the system begins recharging the battery. You can
monitor the battery charge level using the bundled remote monitoring
software.

1.4 Non-Volatility

By utilizing an internal hard drive and battery, the RamSan-120 combines
the performance of SDRAM storage with the non-volatile nature of hard
disk drives. Texas Memory Systems equips the RamSan-120 with an
internal backup hard disk drive. In order to operate the drives after a
power failure occurs, the RamSan-120 contains a backup battery. When
fully functional and fully charged, the battery provide at least seven
minutes of operation.
The RamSan-120 is the first and only solid state disk to implement ECC-
protected DIMMS as a RAID (redundant array of independent DIMMs).
Similar to disk-based RAID, if an entire DIMM inside the unit fails, other
DIMMs will rebuild that information without interruption.
The system monitors the internal disk and battery for a failure condition.
In such an event, it notifies the operator of an error through the front
panel display and the management software.
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