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One last thing occurs to me, and then I'll shut up.  Really. :-)

How much good would a write barrier do on a linux on z/VM anyway?  Would
a barrier message from a linux kernel, through a minidisk and minidisk
cache, through a cp device, to a disk controller, through the
controller's cache preserve a barrier operation?  (Please correct the
i/o path as appropriate)

- -- Pat

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