My guess is the vss-control partitions are the small blocks at the beginning of each volume.
Good idea to check the volumes on the *working* hosts. Results are interesting, if not particular useful. It looks the same on the ESXi hosts that are currently functional. It is, in fact, misreporting the size. The Config > Storage section shows it as 2TB.
Disk /dev/disks/naa.6090a04870ae410990d2343a47783e53: 1099.5 GB, 1099526307840 bytes
255 heads, 63 sectors/track, 133676 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/disks/naa.6090a04870ae410990d2343a47783e53p1 1 133676 1073752406 fb VMFS
I'm going to migrate all of the VMs to another datastore so I can safely try repairing the partition table without having to worry about losing anything.
Thanks for your input. I'll report back here with results once I've safely moved all of the VMs elsewhere.