- TEXAS MEMORY SYSTEMS RamSan-325/325c User's Manual

RamSan-325/325c User’s Manual - 101 -
9.4 Batteries
The RamSan-325 is equipped with three redundant 30-minute sealed lead
acid batteries. The batteries are designed to protect the data in DDR RAM
memory. If the RamSan-325 looses external power, the system continues
to function by running on the internal batteries. Even if both power
supplies are removed or fail, the batteries will continue to operate.
After power fails, the system remains in an active state for up to five
minutes. If power is restored within this time, the system will remain
online.
If the batteries are not fully charged, the system may initiate a shutdown
before the five-minute window has elapsed. This procedure protects the
data in memory by storing it to disk. If running in DataSync mode, the
shutdown operation takes approximately 12 minutes for a fully loaded
system as the system synchronizes data on the disks.
Later models of the RamSan-325 perform a periodic battery test to ensure
the internal batteries are healthy. Twelve hours after powering the system
on, it runs a test that exercises the batteries to ensure they are present
and able to hold charge. There is no risk for data loss during this test
because the power supplies back up the batteries. The system repeats the
test every 30 days after the first test. If the system powers off, the test
cycle starts over. The RamSan reports periodic battery test failures in the
System Event Log and in all of the management utilities, including the
front panel display. If a failure occurs, contact Texas Memory Systems for
a replacement battery immediately.
Important:
The periodic battery test does not guarantee that your batteries will have
enough capacity to back up in all cases. Texas Memory Systems
recommends replacing your batteries every two years, even if they
continue to pass the periodic battery test.
9.5 Fans
The system has one block of 12 fans. The fan block is accessed from the
top of the chassis. Each airflow channel has redundant fans so that cooling
is sufficient as long as one of the two fans is running. If one fan fails, the
system will issue a warning. If both fans in a single channel fail, the
system will issue an error.