Being out of town, I could not recover white-space in time, and all volumes were seen as full by Dell Storage SAN. All VMs froze. Eventually we could fix this problem and most VMs booted up OK. However, in case of one VM with many disks -- it is SQL server -- we see this error on trying to start it - "File system specific implementation of Lookup[file] failed".
Rebooting host ESXi server has not helped, neither VM migrating.
Please advise. Thanks.