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The OS Cannot Start After SAN Boot Is Enabled on the FC HBA Card

Publication Date:  2015-06-25 Views:  167 Downloads:  0
Issue Description
Hardware configuration:
A RH5485 configured with a Fibre Channel (FC) host bus adapter (HBA) card; the server is connected to an FC storage area network (SAN) 5600T.

Symptom:

After the server is connected to the FC SAN by using an optical fibre, the operating system (OS) cannot boot from the local disk. After the server is disconnected from the FC SAN, the OS can normally boot from the local disk.
Handling Process
1.  According to the symptom, the SAN Boot function is enabled on the FC HBA card.

2.  After the SAN Boot function is enabled on the FC HBA card, the server OS preferentially boot from the FC SAN. After the server is connected to the FC SAN, the OS scans all logical unit numbers (LUNs) one by one of the FC SAN. The scanning time depends on the number of LUNs of the FC SAN. If no bootable OS is available on the FC SAN, the OS boots from the local disk. It takes too long time to scan LUNs of the FC SAN. As a result, it is assumed that the OS cannot start.

NOTE:
If the local boot mode is disabled in the basic input/output system (BIOS), the server OS does not boot from the local disk.
Root Cause
After the SAN Boot function is enabled on the FC HBA card, the server OS preferentially boot from the FC SAN. After the server is connected to the FC SAN, the OS scans all logical unit numbers (LUNs) one by one of the FC SAN. The scanning time depends on the number of LUNs of the FC SAN. If no bootable OS is available on the FC SAN, the OS boots from the local disk. It takes too long time to scan LUNs of the FC SAN. As a result, it is assumed that the OS cannot start.

Solution
Solution 1 (for general scenarios)

Perform the following steps to disable boot from SAN in the FC HBA BIOS:

1.  Restart the server, and press Ctrl+B as prompted to enter the HBA card configuration screen, as shown in Figure 1.

Figure 1 HBA card configuration screen



2.  Set BIOS to Disable and press Alt+S to save the settings and exit.

Solution 2 (for the RH5485 only)

Restart the server to enter the BIOS and the first boot option to Legacy Only.

END