On Friday, 06/29/2007 at 09:36 AST, "Richards.Bob"
<[EMAIL PROTECTED]> wrote:
> Out of curiosity, Alan, why aren't z/VM writes "timestamped"?
Host-generated timestamps are part of the older XRC architecture ("z/OS
Global Mirror") that z/VM can't really use. When multiple LPARs or CECs
are involved, you need a single time source (Sysplex Timer or STP) to
ensure that I/Os will be reordered properly at the other end. z/VM
doesn't do time synchronization.
Also, XRC is not available to Open systems, and CP has to be able to
operate in a SCSI environment (z/OS does not). We didn't want to invest
in two technologies.
XRC rebranding to "z/OS Global Mirror" helps us drive home the point that
it is intended for use only by z/OS.
Alan Altmark
z/VM Development
IBM Endicott
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