Texas Memory Systems 325 - Manual (Page 9)

failure occurs, the RamSan-320/325 contains redundant batteries. When
fully functional and fully charged, the batteries are able to provide at least
30 minutes of operation.
The system monitors the internal disks and batteries for a failure
condition. In such an event, it notifies the operator of an error through
the front panel display and the management software.
1.5 Configurable Backup
The RamSan-320/325 allows the administrator to set backup modes for
each LUN individually or system wide.
Active Backup TM mode (optional)
This ideal mode for most users is only available from Texas Memory
Systems. In Active Backup mode, the RamSan uses available internal
bandwidth (i.e. performance not utilized by the applications) to constantly
backup memory to the disks. The system automatically optimizes this
operation to backup the maximum amount of data at any given time
without impacting performance. This means that at any one time, most of
the data already resides on disk. Upon emergency or shutdown, the unit
need only finish the backup that is already nearly completed. Active
Backup is an optional feature on the RamSan-320/325; therefore, some
systems may not display this option.
Datasync mode
In DataSync mode, reads and writes are done only to memory. The disks
remain offline during normal operation. If power loss occurs and the
shutdown timer reaches zero, or the user requests a shutdown, the
system takes the Fibre Channel interfaces offline and synchronizes all data
to the internal hard drives.
Mirror mode
This operational mode provides the highest level of data integrity. The
system mirrors all write operations to the internal hard drives and
memory. The system performs read operations from memory only. This
mode allows read intensive applications to benefit from high speed reads
while ensuring that any data written to the RamSan is simultaneously
written to non-volatile storage.
None (Volatile) mode
This operational mode disables the backup functionality for the LUN
making it completely volatile. In the case of system shutdown or failure,
all data stored in the selected LUN will be lost intentionally.
RamSan-300/320/325 User’s Manual - 5 -