Error message "Exceeded the number of devices that can be detached. Clean up all stale detach entries" appears when detaching a LUN from ESXi (59254)​


KB:

​​https://kb.vmware.com/s/article/59254​​

​​https://vmzoneblog.com/2020/07/08/set-rdms-to-perennially-reserved-for-all-hosts-under-a-vcenter-server/​​


1.Run this command to verify if there are 512 devices listed already:

   vsish -e ls /storage/scsifw/persistDeviceAttrs/uids | wc -l

2.List out LUN/RDM disks currently in use in esxi host

  Get-VMHost XXX |Get-ScsiLun -LunType disk | Export-Csv c:\temp\XXX_lun.csv

3.List out the LUN/RDM disks stored in the VSI node

  vsish -e ls /storage/scsifw/persistDeviceAttrs/uids >> /tmp/vsi.txt


Then import the 2 lists in excel and found the LUN/RDM disks in VSI node that not currently in used.

Remove the perennially reserved for the LUN/RDM disksthat is not existed.

PS Script

--------------------------------------------------------------------------------------------------------------------------

#Connect ESXi server

Connect-viserver 10.172.x.x


#Import LUN/RDM list which need to remove the perennially reserved in ESXi host

$NaaList = Import-CSV "C:\Temp\Naalist.csv"



foreach ($id in $Naalist){


#Assign Variables

$Naaid = $id.WWN


#Remove the perennially reserved flag on the host


$myesxcli = get-esxcli -VMHost 10.172.x.x

$myesxcli.storage.core.device.setconfig($false, "$Naaid", $false)


}


--------------------------------------------------------------------------------------------------------------------------

4.Run this command on ESXi host to check again:

vsish -e ls /storage/scsifw/persistDeviceAttrs/uids | wc -l


Afterthat, detached the LUNs again.