I'm using vmkfstools for backuping virtual disks on a esxi 5.5 from internal datastore to NFS datastore conncted by 1Gbps ethernet.
Time needed for cloning 100GB thin file with about 2GB of data is about 90 seconds, which is fine. I use -d thin, so on the NFS server, the file is only about 2GB. BUT the reverse process (NFS->datastore) takes about 15 minutes. Whole 1Gbps line is saturated. So it seems, that vmkfstools takes the file as it was thick and read and sends whole file. Is there a better
