Internet SCSI communication via UNDI services
View Patent ↗A method and system for emulating a hardware Internet Small Computer System Interface (iSCSI) Host Bus Adapter (HBA) without risking an interruption of communication between a computer and a remote secondary storage device is presented. During normal operations, a (hardware emulating) software iSCSI HBA drives a Network Interface Card (NIC) to afford communication between the computer and the remote secondary storage. If an operating system (OS) anomaly occurs in the computer, the NIC is normally disconnected by the OS. To maintain communication between the computer and the secondary storage device if such an event occurs, a failover network device is called up by the computer's System Management Memory (SMM) Basic Input Output System (BIOS), which allows uninterrupted communication to continue between the computer and remote secondary storage device.
1. A method comprising:
emulating a Host Bus Adapter (HBA) in software to enable a communication of data packets between a computer and a secondary memory via a Network Interface Card (NIC) driver;
disabling the MC driver in response to an anomaly in an Operating System (OS) in the computer, wherein the anomaly in the OS causes a first portion of the OS to be disabled and a second portion of the OS to remain operational;
in response to the NIC driver being disabled due to the anomaly in the OS in the computer, transmitting a System Management Interrupt (SMI) signal from the software emulated HBA to a Basic Input/Output System (BIOS) boot loader in a System Management Mode (SMM) BIOS, wherein the BIOS boot loader contains resident code for booting a target that provides access to the secondary memory; and
in response to the BIOS boot loader receiving the SMI signal from the software emulated HBA, activating a Universal Network Device Interface (UNDI) driver to re-enable the NIC driver for communication via a network between the computer and the secondary memory, wherein the second portion of the OS is an OS driver that is able to communicate with the secondary memory through use of the UNDI driver.
2. The method of claim 1 , wherein the UNDI driver is activated by calling a Basic Input/Output System (BIOS) boot loader to activate the UNDI driver.
3. The method of claim 2 , wherein the BIOS boot loader is called by a System Management Interrupt (SMI) signal from the emulated HBA that is stored within the computer.
4. The method of claim 1 , wherein the secondary memory is a hard drive array.
5. The method of claim 4 , wherein the network is an Internet.
6. The method of claim 1 , wherein the anomaly in the OS is an initiation of a shut-down of the OS.
7. The method of claim 1 , wherein the anomaly in the OS is a loading of an upgrade to the OS.