Warnings of "Cannot get Lun for device naa.#########################" appear for removed LUN(s)

Products

• VMware vSphere ESXi

Issue/Introduction

Customer is wondering why the removed, no longer existing LUN is still reporting warnings. We need an action plan to remove such annoyed warnings.

In VMware Aria Operations such warnings "Cannot get Lun for device naa.#########################" appear. And in /var/run/log/syslog.log of ESXi host we see same warnings.

YYYY-MM-DDTHH:MM:SS lsud[265849]: [info] fd6:GETDEVICEINFO dev name = naa.#########################
YYYY-MM-DDTHH:MM:SS lsud[265849]: [info] fd6:GETDEVICEINFO dev name = naa.#########################
YYYY-MM-DDTHH:MM:SS lsud[265849]: [info] fd6:GETDEVICEINFO dev name = naa.#########################
YYYY-MM-DDTHH:MM:SS lsud[265849]: [warn] Cannot get Lun for device naa.#########################
YYYY-MM-DDTHH:MM:SS lsud[265849]: [info] fd6:GETDEVICEINFO dev name = naa.#########################
YYYY-MM-DDTHH:MM:SS lsud[265849]: [warn] Cannot get Lun for device naa.#########################
YYYY-MM-DDTHH:MM:SS lsud[265849]: [info] fd6:GETDEVICEINFO dev name = naa.#########################
YYYY-MM-DDTHH:MM:SS lsud[265849]: [warn] Cannot get Lun for device naa.#########################
YYYY-MM-DDTHH:MM:SS lsud[265849]: [info] fd6:GETDEVICEINFO dev name = naa.#########################
YYYY-MM-DDTHH:MM:SS lsud[265849]: [warn] Cannot get Lun for device naa.#########################

However, the LUN naa.######################### may have been removed long time ago, and we can not see it either in VC web client or host UI.

 

Environment

VMware vSphere ESXi 7.0

Cause

LUN has been removed from the ESXi host, The LUN is still listed as a detached LUN.

Resolution

We can verify affected LUN(s) by either of the commands,

• esxcli storage core device detached list
  

  [root@esxi01:~] esxcli storage core device detached list
  
  Device UID                           State
  ------------------------------------ -----
  naa.######################### off

• vsish -e ls /storage/scsifw/persistDeviceAttrs/uids and  vsish -e cat /storage/scsifw/persistDeviceAttrs/uids/naa.xxxx
  

  [root@esxi01:~] vsish -e ls /storage/scsifw/persistDeviceAttrs/uids
  naa.#########################
  
  [root@esxi01:~] vsish -e cat /storage/scsifw/persistDeviceAttrs/uids/naa.#########################
  Device Persistent Attributes {
    detached:1 <=== the LUN is in detached list
    perennially reserved:0
    not shared:0
  }

 

To remove a detached LUN, 

• esxcli storage core device detached remove --device naa.######################### or,
• localcli storage core device setconfig -d naa.######################### --detached=false

Additional Information

Production is not impacted but warnings of "Cannot get Lun for device naa.#########################" keep generating.