I did this late last year with two CentOS VM's (on Workstation 5.5).  I would 
have to look for them, but you can create a second "disk" with one of the VMs.  
Then you shut that one down.  With the second one, you add the disk (in the 
config), but don't start the VM.  You have to add a line in each of the VM's 
vmx file to set it to NOT lock that disk.

Now that I think of it, you _might_ need to use VMWare Server to get that line 
to work in the config...I somehow remember building the VMs, but running into 
trouble when I needed the extra flexibility of the disk locking (and I have 
VMWare Server on other PCs so it could have been copied there to finish the 
experiment).

Here's some of the lines I found in one of my configs...maybe some Googling on 
them will figure it out for you?

-----------SNIP-----------
disk.locking = "FALSE"
diskLib.dataCacheMaxSize = "0"
diskLib.dataCacheMaxReadAheadSize = "0"
diskLib.dataCacheMinReadAheadSize = "0"
diskLib.dataCachePageSize = "4096"
diskLib.maxUnxyncedWrites = "0"
scsi1.sharedBus = "VIRTUAL"

scsi1.present = "TRUE"
scsi1:2.present = "TRUE"
scsi1:2.fileName = "ClusterDisk1.vmdk"
scsi1:2.mode = "independent-persistent"
scsi1.virtualDev = "lsilogic"

scsi1:2.redo = ""

----------SNIP--------------

-AJ


  ----- Original Message ----- 
  From: Dr J Pelan 
  To: Brian Kroth 
  Cc: [email protected] 
  Sent: Tuesday, May 20, 2008 5:43 PM
  Subject: Re: [Ocfs2-users] ocfs2 on VMware workstation



  On Tue, 20 May 2008, Brian Kroth wrote:

  > It could be a virtual shared block device.  

  I wasn't asking if it could be done, I was asking if it had been done ;-) 
  However now that you mention it, I suspect some unsupported tricks are 
  required to get Workstation 6 to share a virtual device.

  --
  John P.

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