VMFS-3 is now a journal based file system and has some advantages:

-Better recovery from crashes
-Online File System Check

With ls -a you can view the journal files at the volume leve: ls -a /vmfs/vomumes/Myvolume

[root@esx002 root]# ls -a /vmfs/volumes/data/
.  ..  DC2  .fbb.sf  .fdc.sf  filer  .pbc.sf  .sbc.sf  .vh.sf  VSB.LOCK

-Backup this files on a regular basis
-Run vm-support on regular basis to collect Partition Table info