Undocumented vmx entries

I am setting up a "SAN in a can" to test Linux multipathing and cluster filesystems.

I will have two VMs, each running iSCSI target software, sharing a virtual disk.  I've read the clustering section of the documentation, and I'll be using the following options in the vmx file for each VM:

  -  scsi1.sharedBus = "virtual"

  -  disk.locking = "FALSE"

  -  scsi1:0.mode = "independent-persistent"

(The last one can be set via the GUI.)

A note from the co-worker who first suggested this also mentioned these two settings:

  -  scsi1:0.writeThrough = "TRUE"

  -  scsi1:0.redo = ""

  -  diskLib.dataCacheMaxSize = "0"

I've searched all over, and I can't find any documentation of what these options do.  Anyone know?

Thanks!