Lost connectivity to the device mpx.vmhba32:C0:T0:L0 backing the boot filesystem

[AlanRaczek]

Hi all-

We have 4 hosts running vSphere 6.5 on Cisco UCS-C240-M4's. They have a vSAN configuration. I started to get the 'Lost connectivity to the device mpx.vmhba32:C0:T0:L0 backing the boot filesystem'

for no apparent reason.  This is happening on only one host. I am not sure what logs I need to start checking  or where to start. One thing I am interested in is seeing if there is a disk error (I know this looks like network issues, but I am curious). These machines are not UCS managed. And we are all working remotely so no physical access.

Where to start?

...Alan

[tayfundeger]

These warnings are usually caused by firmware. Are the physical servers you use compatible with vsan? See a warning when you look at VSAN health?

ESXi hosts are not installed on SD card etc. right? If it is installed on SD card, SD card can give such warnings even though there is no malfunction.

[AlanRaczek]

Thank you for the reply.

These servers have been running vSAN for quite a while now, this error occurred out of the blue it seems. Not installed on an SD card as far as I know, I just inherited management

of these systems a few months ago. The disk drives are Samsung 3.8TB Enterprise SSD's. Was curious if a drive failure could cause this. Are there any logs I can check?

...Alan

[tayfundeger]

VSAN 6 Health Check Plugin Nedir? Nasıl Kullanılır?

Check Virtual SAN Health

[AlanRaczek]

More information:

Been digging and it looks like this problem machine boots off of USB Direct-ACCESS off mbxa32. In vCenter this device is in italics. I tried

using vmkfstools to list the /bootbank directory and this volume shows up red and it said it cannot open that volume. On another machine this

works just fine.

I am not familiar with USB Direct-Access. Is this an actual USB drive?

...Alan