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300-610 · Question #284

Refer to the exhibit. A Cisco engineer is configuring a Cisco UCS integrated infrastructure for SAP HANA that consists of 8 x Cisco UCS B/C480-M5 servers for SAP HANA and 4 x Cisco UCS C240-M5 C-Serie

The correct answer is D. The boot parameter ip=ibft is not set. The iSCSI LUNs are not recognized during RHEL8 installation on Cisco UCS C-Series servers with a VIC adapter because the boot parameter ip=ibft was not set.

Compute Design

Question

Refer to the exhibit. A Cisco engineer is configuring a Cisco UCS integrated infrastructure for SAP HANA that consists of 8 x Cisco UCS B/C480-M5 servers for SAP HANA and 4 x Cisco UCS C240-M5 C-Series rack mount servers for storage. The rack servers are equipped with Cisco VIC 1225T. The engineer plans to install RHEL8, but the boot process is interrupted at installation because the iSCSI LUNs are not recognized by the VIC adapter. After proper investigation, the engineer concludes that the initiator and target configuration that is programmed on the primary iSCSI VNIC to the operating system is missing. What is the reason for the issue?

Exhibit

300-610 question #284 exhibit

Options

  • AThe storage system is not reachable
  • BThe network interfaces are not configured
  • CThe Linux ISO image is not Cisco approved
  • DThe boot parameter ip=ibft is not set

How the community answered

(37 responses)
  • A
    5% (2)
  • B
    11% (4)
  • C
    3% (1)
  • D
    81% (30)

Why each option

The iSCSI LUNs are not recognized during RHEL8 installation on Cisco UCS C-Series servers with a VIC adapter because the boot parameter ip=ibft was not set.

AThe storage system is not reachable

While a non-reachable storage system would prevent LUN recognition, the problem description explicitly states the initiator and target configuration is missing to the OS, implying a host-side configuration issue.

BThe network interfaces are not configured

The network interfaces on the VIC are configured, but the issue is about the OS receiving the iSCSI boot configuration, not merely the interface being active.

CThe Linux ISO image is not Cisco approved

A non-approved Linux ISO image would likely cause broader installation failures, not specifically the lack of iSCSI LUN recognition due to missing initiator/target configuration.

DThe boot parameter ip=ibft is not setCorrect

When booting from iSCSI on Cisco UCS C-Series servers using a VIC, the operating system installer needs to retrieve the iSCSI initiator and target configuration from the iSCSI Boot Firmware Table (iBFT) programmed by the VIC. The ip=ibft boot parameter instructs the Linux kernel to read and utilize this iBFT information, enabling the installer to discover and access the iSCSI LUNs for installation.

Concept tested: iSCSI boot parameter for Linux on UCS VIC

Source: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c/sw/os/install/redhat/install_redhat_iscsi.html

Topics

#Cisco UCS#iSCSI boot#RHEL#iBFT

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