Unable to mount a datastore with error "An error occurred during host configuration: .<br/>Operation failed, diagnostics report: Unable to complete Sysinfo operation. Please see the VMkernel log file for more details.: Read only: VSI node (####:)"

Products

• VMware vSphere ESXi

Issue/Introduction

• When trying to mount a datastore via vCenter or Host UI, you see the error "An error occurred during host configuration: .<br/>Operation failed, diagnostics report: Unable to complete Sysinfo operation.  Please see the VMkernel log file for more details.: Read only: VSI node (####:)".
• In the vmkernel logs of the ESXi host, you may see errors as the example below:

2024-09-01T13:05:56.091Z cpu59:33773)NMP: nmp_ThrottleLogForDevice:3333: Cmd 0x89 (0x43be1e8451c0, 81679675) to dev "naa.xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" on path "vmhba1:C0:T0:L2" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0x7 0x27 0x0. Act:NONE 
2024-09-01T13:05:56.091Z cpu59:33773)In (182) vmkernel: cpu29:2088560 opID=3b99302b) LVM: 17308: Failed to open device naa.xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx:1 : Read only

• The LUN you are trying to use may be a replicated LUN or a new LUN.
  • If replicated LUN, you are receiving the error mentioned above regardless if the task is tried with "Assign new signature" or "Keep existing signature".

 

 

Note: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.

Environment

VMware ESXi 7.0.x

VMware ESXi 8.0.x

Cause

The LUN is presented in a "Read-only" mode.

Please note, the LUN has to be in a condition to accept write commands for the ESXi host to be able to mount a datastore from it.

Resolution

Change the presentation mode of the LUN to Read-Write, or the correspondent of this mode in the array in use.

If any assistance is needed to check/change this presentation mode, please engage with your storage vendor.