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Check the user guide at http://www.intel.com/support/motherboards/server/sb/CS-022358.htm - the only place I see about setting the stripe size is when creating a new array.
Thanks for your response Dan. I have gone through the user guide but couldn't find a viable solution to my problem.
The user guide says that if there is a "Configuration Mis-match" between RAID Controller NVRAM and Actual Disk Layout, there will be a new prompt shown during RAID Controller initialization but I haven't got that prompt.
I have deleted the configuration from RAID BIOS Console and re-created new configuration with RAID 5 and Strip sizes 1MB, 256KB and 512KB in the order they were specified. After applying new configuration each time with changed Strip Size, I did consistancy check to verify RAID Array integrity.
None of that helped me. I came to a conclusion that all the data on RAID is lost. Good that I have a tape backup of essential files. I am going re-initialize RAID and install VMWare ESX Server 4 from scratch.
I don't see any other possibile solution unless someone in this community can come up with one. This time I am going to install VMWare on a USB stick attached to motherboard to improve performence and to ease future upgrades..