I have been looking into ways to add a writable layer to read only DASD for a while now, including ovlfs. Ovlfs simply doesn't do the job, unfortunately. I have problems with data getting lost between boots and it seems to continue to consume memory until the linux host eventually dies. So ovlfs is out.
That brings me to User Mode Linux's "layered block devices" and it's Copy-On-Write feature. This appears to do exactly what I'm looking for, but is only available for the User Mode Linux virtual architecture. Any s390 kernel programmers here know if this could be implimented? Or are things just too different.
*Brandon
P.S. Thanks for the responses on J2EE! :)
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