title: VM doesn't work anymore after umount an lv
body: <p>i'm not a system administrator so i think that i made a big mistake!
  we had a problem of storage distribution on VMs in the openstack private cloud.
  So i took one VM to reduce the storage and i tried first to execute <code>lvreduce</code> to reduce the logical volume but it asks me to <code>umount</code> the lv before.
  So i run <code>umount &lt;path-of-my-lv&gt; -l</code> 
  and after that i have not access to vms on ssh even when i rebooted it from the openstack dashboard.</p>
  
  <p>I got this Error when i tried to connect using ssh as usual </p>
  
  <p><strong>Remote side unexpectedly closed network connection</strong></p>
  
  <p>any propositioin please ? </p>
  
  <p>Thanks for advance</p>