Texas Memory Systems RamSan-300/320 User Manual

 

 

 

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. 

 

The RamSan-320 allows the administrator to set backup modes for each 

LUN individually or system wide. 
 

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; therefore, some 

systems may not display this option. 
 

DataSync mode provides the highest performance for system operation.  

In this 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 three-way mirrors all write operations to all three 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 User’s Manual 

 

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