@alejandro-anv I have had problems like this on my NFS and iSCSI SR's previously. One thing that might help is to shutdown the VM's before doing a re-scan. If my memory serves me, it does a different kind of coalesce (online vrs offline) and this has a better chance of success. Also, be aware that from the time you re-scan and the time it actually starts to do work on the drives is 5 minutes. When I have a problem like this, I normally ssh into the pool master and tail the logfiles to watch it work. IE: tail -f /var/log/SMlog | grep SMGC Its boring.. But.. it gives me a bit of comfort between prayers 8-)