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A UVP Cannot Be Loaded from the Network When SAS Cables Are not Properly Connected to the Hard Disk Backplane

Publication Date:  2015-06-25 Views:  284 Downloads:  0
Issue Description
When computing node agent (CNA) nodes (using 20 RH2285s) are upgraded from TR5 to TR6 in an office, the unified virtualization platform (UVP) operating system (OS) cannot be loaded or installed from the network in an CNA node. After the UVP OS restarts repeatedly, OS loading fails. Figure 1 shows the interface in standstill state.

Figure 1 Journal creation

Handling Process
1.  Replace the two hard disks (server A has two hard disks) in a faulty CNA node (server A for short), and load the UVP from the UVP ISO file. However, the problem persists, as shown in Figure 1. Therefore, the hard disks are normal.

2.  Office upgrade is urgent. Therefore, the office uses server B instead of server A as the CNA node, and the two hard disks removed from server A are installed in server B (server B has two hard disks). Then reload the UVP to complete the upgrade.

3.  Replace the RAID controller card in server A to continue the verification. The UVP is loaded from the UVP ISO file; however, the loading fails, and partition creation takes a long time, indicating that connectors for the RAID controller card and SAS cables are normal.

4.  Replace SAS cables in server A. Partition creation is normal; however, when the system displays the interface shown in Figure 2, the interface stops for over 10 minutes. Maintenance personnel misunderstand that the loading fails because they have no idea about the time (about 30 minutes) for loading and installing the UVP. In this case, connectors for SAS cables and the hard disk backplane are faulty.

5.  Reinstall the RAID controller card and SAS cables (that is, the original RAID controller card and SAS cables for server A) in server A, reload server A, and wait for 15 minutes. The loading succeeds.

Figure 2 UVP installation

Root Cause
Based on the preceding attempts, check that UVP loading fails in a CNA node due to poor connection between SAS cables and the hard disk backplane.

Remove and reinstall SAS cables, and check that the connection (hard disk > hard disk backplane > SAS cables > RAID controller card > main board) is correct.

1.  When assembling or transporting devices, prevent the devices from shaking or bumping. When replacing components, ensure that the link connection is correct, and cables are firmly connected.

2.  The time to load and start the UVP is about 30 minutes. In this period, the keyboard, video, and mouse (KVM) interface stops (shown in Figure 2).