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LAN Shared Memory Device Driver  



Local area network (LAN) communications between OpenVMS Galaxy instances are supported by the Ethernet LAN shared memory driver. This LAN driver communicates to other instances in the same OpenVMS Galaxy system through shared memory. Communicating with other instances through shared memory provides performance benefits over traditional LANs.

To load the LAN shared memory driver SYS$EBDRIVER, enter the following command:

$ MCR SYSMAN
SYSMAN> IO CONN EBA/DRIVER=SYS$EBDRIVER/NOADAPTER
For OpenVMS Version 7.3-1 and later, in order for LAN protocols to automatically start over this LAN device (EBAn, where n is the unit number), the procedure for loading this driver should be added to the configuration procedure:

SYS$MANAGER:SYCONFIG.COM.

The LAN driver emulates an Ethernet LAN with frame formats the same as Ethernet/IEEE 802.3 but with maximum frame size increased from 1518 to 7360 bytes. The LAN driver presents a standard OpenVMS QIO and VCI interface to applications. All existing QIO and VCI LAN applications should work unchanged.

In a future release, the SYS$EBDRIVER device driver will be loaded automatically.


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