Texas Memory Systems 325 - Manual (Page 106)

9.4 Batteries
The RamSan-320/325 is equipped with three redundant 30-minute
Lithium Ion batteries. The batteries are designed to protect the data in
SDRAM memory. If the RamSan-320/325 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-320/325 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.
RamSan-300/320/325 User’s Manual - 102 -