On Thu, Jan 29, 2015 at 09:27:32PM +0000, Gerard Beekmans wrote: > > -----Original Message----- > > Are you certain that the volume / > > storage behind dm-9 is in decent shape? (i.e. is it really even > > an xfs filesystem?) ..... > The outage occurred at the SAN level making the NFS storage > unavailable which in turn turned off all the VMs running on it > (turned off in the virtual sense). Define "SAN" outage. All this tells me is that the backing store went bad in some way and needed recovery, not what the actual problem in the SAN was. If it was a potential data loss event, then that's the prime candidate for the storage returning zeros where there should be data. The second candidate is the NFS server. What was the NFS server? Did the NFS server get rebooted? Did the NFS clients (i.e. the physical machines running the hypervisor, not the guests) get rebooted too? If you reboot the server, the NFS clients are supposed to retransmit any unstable data they have to the server. If the clients are rebooted or the NFS mount forcible unmounted while the server is down, then that unstable data is lost forever. Really, fully zeroed blocks in critical XFS metadata blocks is almost always an indication of data loss somewhere in the lower layers of the storage stack. As a precaution, though, if one vmdk is bad, I'd consider all the others as suspect, even if the filesystem checkers haven't thrown errors. Random block data loss can really only be reliably recovered from backups, as user data is notoriously difficult to validate as correct. ..... > It is possible that it is the vmware VMDK file that belongs to > this VM that is the issue but it does not appear to be corrupt > from a vmdk standpoint. Just the data inside of it. Also, you are using VMDK image files, that implies you are running ESX as your hypervisor, yes? If so, that limits our ability to help you track the source of the corruption... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
