How to unmount a LUN or detach a datastore device from ESXi hosts

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Source: How to unmount a LUN or detach a datastore device from ESXi hosts (2004605) | VMware KB

 

Umount Datastore LUN

LUN removal checklist

 

  • No virtual machine, template, snapshot or CD/DVD image resides on the datastore
  • The datastore is not part of a Datastore Cluster
  • Storage I/O Control is disabled for the datastore
  • The datastore is not used for vSphere HA heartbeat
  • The LUN is not used as a RDM
  • The Datastore is not used as a scratch location
  • The Datastore is not used as VMkernel Dump file location (/vmkdump/)
  • The Datastore is not used as active vsantraced location (/vsantrace/)
  • Advanced Settings / Syslog location change to []/tmp

 

 

Removal Check list Steps

All items should be self explanatory except the ones below

 

Scratch Location

Simply change the path to the scratch in advanced settings to []/tmp

 

Remove Dump File

Check for file, and remove if exists and linked to datastore you are trying to unmount

# esxcli system coredump file list

# esxcli system coredump file remove –force

 

VSANTraced

To remove the log, simply stop vsantraced, unmount the datastore and start it again:

# lsof |grep vsantraced |grep volumes

# /etc/init.d/vsantraced stop

# /etc/init.d/vsantraced start

 

Syslog usage

Simple remove the path in advanced settings and click OK