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Stream-Optimized Compressed VMDK Grain Ordering

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From the VMware Virtual Disks: Virtual Disk Format 1.1 doc, it states:

 

Stream-optimized compressed extents are meant to be easily streamed over a network link.
They are designed to minimize the memory footprint of the server streaming the virtual disk
and also allow for the use of a simple client application.

 

Are there any guarantees about the grain ordering in the stream-optimized VMDK?  For example, I have a client that wants to take a single pass to write all data to a destination disk.  If there's a guarantee that the grains are in ascending offset order, it's simple to write zeros as necessary.  If not, then I need to either keep track of unwritten sectors or zero out the disk before writing to the destination.

 

What's the best way to write a simple client to accomplish this task?

 

Thanks!

Mike


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