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Announcement on H3C Uniserver G3 Server Hard Disk Alarms in Predictive Hot Unplugging of NVMe SSD Disks

2020-08-18 Published
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孟普 六段
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Problem Description

Product Model

Related models are listed below

H3C UniServer R2700 G3H3C UniServer R2900 G3H3C UniServer R4700 G3H3C UniServer R4900 G3H3C UniServer R6900 G3H3C UniServer R4300 G3H3C UniServer R6700 G3H3C UniServer R8900 G3H3C UniServer R5300 G3

H3C UniServer B5700 G3H3C UniServer B7800 G3H3C UniServer B5800 G3

Involved version

null

Problem Description

When the related servers are installed with NVMe SSD disks, if VMD (Volume Management Device) is enabled in the BIOS, and the ledmon.service is running on the Linux system, after performing predictive hot-unplugging of the NVMe SSD disks, the hard disk orange light is always on and HDM will generate an alarm corresponding to the hard disk. The specific alarm information is as follows:

                                                

                                                                              Figure 1   The HDM disk alarm log



Cause Analysis

Cause Analysis

In Linux system, ledmon and ledctl tools are usually used to manage the indicator lights of hard disks. When the ledmon.service is running in the Linux system and VMD is enabled, execute the predictive hot-unplug command for the NVMe hard disk:

echo 1 > /sys/block/nvmeXn1/device/device/remove
Note: Bold X represents the device number in the system

After executing the above command, the ledmon.service will light up the steady on orange light of the corresponding NVMe SSD disk to indicate that the hard disk has been removed. The steady on orange light indicates a hard disk failure. Therefore, HDM will generate an alarm log corresponding to the hard disk at this time.

This problem is caused by the lighting mechanism of the ledmon tool, not an NVMe SSD disk problem. This problem has no impact on the disk. Unplug the corresponding NVMe SSD from the physical slot (predictive hot unplugging action is completed), the corresponding alarm can be stopped. The corresponding logs in HDM are as follows after the alarm is cleared:

Figure 2   HDM disk logs after the alarm is cleared

If the above server is running a Windows Server system, when VMD is enabled, VROC is usually used to manage NVMe SSD disks. Click remove in the VROC to predictably hot remove the NVMe hard disk. And the VROC will light up the blue light of the corresponding NVMe SSD disk, which will not cause HDM recording hard disk alarms.



Circumvention measures/solutions

Circumvention Measures/Solutions

The above problem belongs to the normal record of HDM"s hard disk lighting logic, not a hardware problem, and no solution are required.



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