how I can create iscsi disks in vmware workstation

Oh dear...this is going to get complicated and messy...I can see it coming a mile off.

1. Create a new VM and install a suitable OS that provides iSCSI target functionality.
2. Configure OS in 1 to allow iSCSI connections, configure iSCSI LUNS, configure the iSCSI initiator details(your 2008 VM's)
3. Within your 2008 virtual machines, start the iSCSI initiator and provide the IP address of the VM create in step 1.
4. Present your iSCSI LUNS (created at step 2) to your 2008 VM's
5. Check the disk works correctly and then create your 2008 cluster

You know need to find an iSCSI target that works with 2008 clusters - and OPENFILER isn't it.

Good luck...come back when you need more help.

The article is for creating OpenFiler iSCSI SAN to be used with VMware ESX but follow the same process for creating a quorum and disk volume for MS Cluster.
http://www.petri.co.il/use-openfiler-as-free-vmware-esx-san-server.htm 

arunraju - OPENFILER iSCSI works great with Windows 2008 - but it does not (I repeat NOT) work if you want to cluster the 2008 servers together.

DWTCIT - I've been down this route and Openfiler does not work with WIndows 2008 clusters.

I believe the Openfiler team will have a fix with version 2.4 but it hasn't been fixed yet.

Appears that someone got it working with FREENAS

http://virtual3c.blogspot.com/2009/08/setting-up-iscsi-drives-using-freenas.html

In that case download freenas and install as a VM.  Point both Windows 2008 servers to it using MS iSCSI connector, the link above gives a good step by step

PDF Guide - http://www.rocketdivision.com/info/starwind_and_mscluster.pdf