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Case 2 PXE Booting Fails in an RH2285

Publication Date:  2015-06-25 Views:  399 Downloads:  0

Issue Description

Hardware configuration:
RH2285 server, 12 hard disks, and 1068E controller card


The server has configured network interface cards (NICs) as the first booting item. However, the server cannot be started from the NIC preboot execution environment (PXE), and the system displays iscsi image is not found in the NVRAM, as shown in the red box in Figure 1.

Figure 1 Error information against PXE startup

Handling Process

Check that the PXE configuration is correct in the server basic input/output system (BIOS). The error information indicates that the iSCSI image file is not in the NVRAM, and the system cannot find the booting device. View MBA Configuration Menu, and find that Boot Protocol is incorrectly set, as shown in Figure 2.

Figure 2 NIC in iSCSI boot mode

Root Cause

The PXE works in client/server mode, allows computers to download images from the remote server through the network, and supports the ability to boot the operating system (OS) from the network. During OS booting, the client requires the server to allocate an IP address, and uses Trivial File Transfer Protocol (TFTP) or Multicast Trivial File Transfer Protocol (MTETP) to download a booting software package to the local memory. Then the package is executed to configure the basic software at the client to start the client OS installed in the server. The NIC is configured as the iSCSI boot mode instead of the PXE boot mode; however, it is not connected to the target iscsi device. Therefore, no booting device is available.

Boot Protocol under MBA Configuration Menu is not set to Preboot Execution Environment (PXE). Therefore, the server cannot be started from the PXE. The NIC is not connected to the target iSCSI device. Therefore, when the network is set to the iSCSI boot mode, the preceding error information is displayed.


During server startup and NIC self-test, press Ctrl+s. In the displayed MBA Configuration Menu, set Boot Protocol to Preboot Execution Environment (PXE), as shown in Figure 3.

Figure 3 NIC in PXE boot mode


Do not change the default server configuration. During NIC PXE booting, if the system displays iscsi image isnot found in the NVRAM, and the NIC PXE cannot be properly booted, configure the NIC mode as the PXE boot mode by referring to the case.