To set the LUN’s backup mode via the Web Management Interface:
• Click on the “Management Control Processor” graphic.
• Click on the “LUN Config” tab.
• Select the LUN to edit by clicking on the LUN graphic.
• Click the “Modify LUN” button.
• Select the backup mode from the “Backup Mode” listbox.
• Click the “OK” button.
6.9.2 Via Text Management To set a LUN’s backup mode via the Text Management Interface:
• From the Telnet Main Menu, select “LUN Setup”
• Select “Modify LUN(s)”
• Select LUN (See instructions in Section 6.5 )
• Select “Set backup mode for this LUN”
• Choose the backup mode from the sub-menu and press
[ENTER]
• Select “Exit to the LUN configuration menu”
• To save the changes once you have completed all LUN
configuration, select “Save changes and exit”
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.
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.
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