Texas Memory Systems RamSan-300/320 manual Configurable Backup, Active BackupTM mode optional

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.

1.5Configurable Backup

The RamSan-320 allows the administrator to set backup modes for each LUN individually or system wide.

Active BackupTM 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; therefore, some systems may not display this option.

Datasync mode

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.

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